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• Sending email with exim and external sender address

  - by Tronic

  i have following problem: i want to send emails with an rails webapp. i set up an exim server and when looking into the logs, the sending works, but the emails aren't sent really. i had the same problem with another isp. the sender address is hosted on another mailserver, other isp. i think the problem is, that sending doesn't work because the sener address isn't hosted on the same server. do you have any advice on this? the logs (exim) tell me the following: 2011-01-01 14:38:06 1PZ1eo-0000Ga-38 <= <> R=1PZ1eo-0000GY-1p U=Debian-exim P=local S=1778 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.131] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 Completed [email protected] is the external sender-address! thank you! Edit with more details when sending a mail from command line with echo "Test" | mail -s Testmail [email protected] the logs says 2011-01-01 20:45:24 1PZ7OG-0001Vp-Rx <= root@gustav U=root P=local S=360 2011-01-01 20:45:26 1PZ7OG-0001Vp-Rx => [email protected] R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [209.85.229.27] X=TLS1.0:RSA_ARCFOUR_MD5:16 DN="C=US,ST=California,L=Mountain View,O=Google Inc,CN=mx.google.com" 2011-01-01 20:45:26 1PZ7OG-0001Vp-Rx Completed and i get the mail on my gmail account. but when sending by webapp (when testing locally with sendmail it works fine) i only get this log output 2011-01-01 20:50:08 1PZ7Sq-0001X9-L4 <= <> R=1PZ7Sq-0001X7-Jo U=Debian-exim P=local S=1780 2011-01-01 20:50:11 1PZ7Sq-0001X9-L4 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.3] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 20:50:11 1PZ7Sq-0001X9-L4 Completed

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• Registry remotley hacked win 7 need help tracking the perp

  - by user577229

  I was writing some .VBS code at thhe office that would allow certain file extensions to be downloaded without a warning dialog on a w7x32 system. The system I was writing this on is in a lab on a segmented subnet. All web access is via a proxy server. The only means of accessing my machine is via the internet or from within the labs MSFT AD domain. While writing and testing my code I found a message of sorts. Upon refresing the registry to verify my code changed a dword, instead the message HELLO was written and visible in regedit where the dword value wass called for. I took a screen shot and proceeded to edit my code. This same weird behavior occurred last time I was writing registry code except on another internal server. I understand that remote registry access exists for windows systems. I will block this immediately once I return to the office. What I want to know is, can I trace who made this connection? How would I do this? I suspect the cause of this is the cause of other "odd" behaviors I'm experiencing at work such as losing control of my input director master control for over an hour and unchanged code that all of a sudden fails for no logical region. These failures occur at funny times, whenver I'm about to give a demonstration of my test code. I know this sounds crazy however knowledge of the registry component makes this believable. Once the registry can be accessed, the entire system is compromised. Any help or sanity checking is appreciated.

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• iptables captive portal remove user

  - by Burgos

  I followed this guide: http://aryo.info/labs/captive-portal-using-php-and-iptables.html I am implementing captive portal using iptables. I've setup web server and iptables on linux router, and everything is working as it should. I can allow user to access internet with sudo iptables -I internet -t mangle -m mac --mac-source USER_MAC_ADDRESS -j RETURN and I can remove access with sudo iptables -D internet -t mangle -m mac --mac-source USER_MAC_ADDRESS -j RETURN However, on removal, user can still open last viewed page as many times he wants (if he restart his Ethernet adapter, future connections will be closed). On blog page I found a script /usr/sbin/conntrack -L \ |grep $1 \ |grep ESTAB \ |grep 'dport=80' \ |awk \ "{ system(\"conntrack -D --orig-src $1 --orig-dst \" \ substr(\$6,5) \" -p tcp --orig-port-src \" substr(\$7,7) \" \ --orig-port-dst 80\"); }" Which should remove their "redirection" connection track, as it is written, but when I execute that script, nothing happens - user still have access to that page. When I execute /usr/sbin/conntrack -L | grep USER_IP after executing script I am having nothing returned, so my questions: Is there anything else that can help me clean these track? Obviously - I can't reset nor mine, nor users network adapter.

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• Why does hiberfil.sys come back from the dead on Windows 7?

  - by Corey White

  I have Windows 7 running on a small (40GB) partition, with 4GB ram. This means that the hiberfil.sys file created by Hibernate takes up a significant portion of the available diskspace. I would like to remove it. I am aware that I can disable Hibernate and remove hiberfil.sys by entering powercfg -h off in an elevated command prompt. This works -- the file is immediately removed, and after doing so, the HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Power\HibernateEnabled key is (correctly) set to 0. However, the next time I reboot the PC, hiberfil.sys returns from the dead, Hibernate is reenabled, and that registry key has returned to 1. I'm pretty much at my wits' end with this. Almost everything I can find online related to removing the hiberfil.sys file simply suggests using powercfg to turn off hibernation, and that appears to work for just about everyone. But it just keeps coming back for me! (Like a vampire, sucking up my disk space.) I did find one other thread from someone who seems to have had the same issue, but none of the suggestions there worked for the original poster (or for me). Still, I have tried everything listed there, including: Disabling hybrid sleep Disabling Hibernate through the command prompt, through the Power Options GUI, and through both (in both orders) Manually changing the HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Power\HibernateEnabled key Pretty much everything else I can think of! I do want to reiterate that I have no problem removing the file -- that works great. It just comes back after every reboot. I'm about ready to throw in the towel and just run a script on login to disable Hibernate each time, even though that seems like a crazily hacky "solution" . . . but I was hoping someone here could suggest something else, first. Thanks!

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• Dell Driver Support for Latitude E6320 Windows 7 Enterprise

  - by IamPolaris

  I recently did a reinstall of Windows 7 Enterprise on a Dell Latitude E6320, which is a 64 bit system. After the install process, and doing typical Windows Update stuff, I looked at my Device Manager and found that I had devices which were missing drivers. My missing drivers: After going to the Dell Support site and looking at the files, and doing some sleuthing I found the following support document: http://downloads.dell.com/utility/Latitude%20E-Family%20%20Mobile%20Precision%20Re-Image%20How-To%20Guide%20-%20A03%20Rev%203%200.pdf This document hints in appendix C that the Broadcom USH is the Control Point Security and the Unknown device is Micro freefall sensor. The network controller is my wireless, as I cannot connect wirelessly, and the final missing driver I am not sure. Attempting to install the control point security exe on the support page will not work. After downloading, I am given the message that I am attempting to install a 32 bit driver on a 64 bit machine EVEN THOUGH I selected the win7 64 bit option from the support page. Beyond that, some of the drivers (Which are confusing to read and hard to understand what they do) and the system utilities which are supposedly supposed to make this process simpler will either a) not run because they are 32 bit exe's or b) the support page cannot find the file attempted to download. Is there anything I can do to get (at the very least) my wireless running, but idealistically all of my drivers. A solution which assumes Dell is completely incompetent would be ideal. :P Some forums have said that I should download the chipset driver, others say to get the system utility file (DSS_UTIL_WIN_R282536.EXE). I have had no luck as of yet...

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• How to Enable IPtables TRACE Target on Debian Squeeze (6)

  - by bernie

  I am trying to use the TRACE target of IPtables but I can't seem to get any trace information logged. I want to use what is described here: Debugger for Iptables. From the iptables man for TRACE: This target marks packes so that the kernel will log every rule which match the packets as those traverse the tables, chains, rules. (The ipt_LOG or ip6t_LOG module is required for the logging.) The packets are logged with the string prefix: "TRACE: tablename:chain- name:type:rulenum " where type can be "rule" for plain rule, "return" for implicit rule at the end of a user defined chain and "policy" for the policy of the built in chains. It can only be used in the raw table. I use the following rule: iptables -A PREROUTING -t raw -p tcp -j TRACE but nothing is appended either in /var/log/syslog or /var/log/kern.log! Is there another step missing? Am I looking in the wrong place? edit Even though I can't find log entries, the TRACE target seems to be set up correctly since the packet counters get incremented: # iptables -L -v -t raw Chain PREROUTING (policy ACCEPT 193 packets, 63701 bytes) pkts bytes target prot opt in out source destination 193 63701 TRACE tcp -- any any anywhere anywhere Chain OUTPUT (policy ACCEPT 178 packets, 65277 bytes) pkts bytes target prot opt in out source destination edit 2 The rule iptables -A PREROUTING -t raw -p tcp -j LOG does print packet information to /var/log/syslog... Why doesn't TRACE work?

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• Diagnosing Logon Audit Failure event log entries

  - by Scott Mitchell

  I help a client manage a website that is run on a dedicated web server at a hosting company. Recently, we noticed that over the last two weeks there have been tens of thousands of Audit Failure entries in the Security Event Log with Task Category of Logon - these have been coming in about every two seconds, but interesting stopped altogether as of two days ago. In general, the event description looks like the following: An account failed to log on. Subject: Security ID: SYSTEM Account Name: ...The Hosting Account... Account Domain: ...The Domain... Logon ID: 0x3e7 Logon Type: 10 Account For Which Logon Failed: Security ID: NULL SID Account Name: david Account Domain: ...The Domain... Failure Information: Failure Reason: Unknown user name or bad password. Status: 0xc000006d Sub Status: 0xc0000064 Process Information: Caller Process ID: 0x154c Caller Process Name: C:\Windows\System32\winlogon.exe Network Information: Workstation Name: ...The Domain... Source Network Address: 173.231.24.18 Source Port: 1605 The value in the Account Name field differs. Above you see "david" but there are ones with "john", "console", "sys", and even ones like "support83423" and whatnot. The Logon Type field indicates that the logon attempt was a remote interactive attempt via Terminal Services or Remote Desktop. My presumption is that these are some brute force attacks attempting to guess username/password combinations in order to log into our dedicated server. Are these presumptions correct? Are these types of attacks pretty common? Is there a way to help stop these types of attacks? We need to be able to access the desktop via Remote Desktop so simply turning off that service is not feasible. Thanks

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• Linux: can't downgrade ATI graphic driver

  - by java.is.for.desktop

  I had the old 10.9 driver of ATI, it worked fine. Sadly, I decided to upgrade it to the new 10.12. After that, HDMI stopped working. So, I want to downgrade back to 10.9. I did everything by the book. But it fails: As root, I do: cd /usr/share/ati sh ./fglrx-uninstall.sh Yes, the uninstall process tells me that everything is fine uninstalled. And after doing reboot, I have the default opensource ATI driver which comes with X11 (or the kernel?). The ATI control panel shortcut points to nowhere. So, the driver seems uninstalled. Now I install the older (10.9) proprietary ATI driver. It also finishes successfully. But after reboot, the ATI control panel tells me that I still have 10.12. And it seems to be true, because HDMI doesn't work. So, how can I completely purge the new non-working driver and downgrade to the old one?

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• Microsoft Mouse and Keyboard Center Needed for Keyboard but Doesn't Support Mouse

  - by eljay

  I recently built a new computer (running Win7 Pro 64-bit) that includes the Microsoft Sidewinder X4 Keyboard. To make use of all the extra features of this keyboard I need the Mouse and Keyboard Center. I just ran Windows Update for the first time on this system and the Mouse and Keyboard Center was included in the update. I'm left-handed and before the update I had the mouse set up for lefty use. Now after the update, it's been set to righty use and the original mouse control panel applet no longer allows the assignment of buttons. For that there's a link to the Mouse and Keyboard Center which does not support my oldish mice. (I have an IntelliMouse Optical and a Creative Mouse Lite Pro.) So I need the new utility for my keyboard, but I have to be right-handed to use my mouse? Really! I tried changing HKCU\Control Panel\Mouse\SwapMouseButtons to 1, but a reboot set it back to 0. Is there some way I can change my mouse back to left-handed? Thanx -eljay

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• WWNs,WWPNs and Fibre Channel addresses

  - by user238230

  Lots of contradictory on these subjects and I don't know why. My first question is about the 64 bit WWN. One reference claims the terms WWN and WWPN are synonymous. An online source seems to refute this. They say: A WWPN (world wide port name) is the unique identifier for a fibre channel port where a WWN (world wide name) the unique identifier for the node itself. A good example is a dual port HBA. There will be two WWPN's (one for each port) and only a single WWN for the card itself. Question #1: Which is correct? I’m almost positive I read that every “Port” has a WWN. My next question is about the 24 bit FC address that is dynamically allocated to a port when it is introduced to the switch. The Domain ID field is defined as: "a unique number provided to each switch in the fabric." Question #2: Do Domain IDs only apply to switch ports? For example what would the Domain ID be for a HBA? None? The same as the switch port it is connected to? Question #3: My last question is about the Name Server of a switch. A book example shows the routing of a message through the switch. It uses the WWNs of the source and destination ports to route the message. I am assuming that the Name Server must associate the WWN and the FC address in some way in order to route the message, correct?

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• KVM and libvirt: How to configure a new disc device to an existing VM?

  - by initall

  I've got an Ubuntu 9.04 server running two VM's. In /etc/libvirt/qemu/machine1.xml two disk devices are defined like this: <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <source file='/vserver/machine1/disk0.qcow2'/> <target dev='hda' bus='ide'/> </disk> <disk type='file' device='disk'> <source file='/vserver/machine1/disk1.qcow2'/> <target dev='hdb' bus='ide'/> </disk> I need more storage space in at least one of the devices and thought about adding a third hdc device by simply adding one with same style as above and re-organising my mount structure (The virtual sizes of the current qcow2 files are unfortunately limited.) My problem is that reloading libvirtd and restarting the VM do not result in a new visible device (checked with fdisk). I'm aware of extending an existing qcow2 file (converting to raw format, cat-ing/adding the new one, using smth. like gparted) - but only as a last resort. Hopefully it's something very simple I'm missing?

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• iptables to block VPN-traffic if not through tun0

  - by dacrow

  I have a dedicated Webserver running Debian 6 and some Apache, Tomcat, Asterisk and Mail-stuff. Now we needed to add VPN support for a special program. We installed OpenVPN and registered with a VPN provider. The connection works well and we have a virtual tun0 interface for tunneling. To archive the goal for only tunneling a single program through VPN, we start the program with sudo -u username -g groupname command and added a iptables rule to mark all traffic coming from groupname iptables -t mangle -A OUTPUT -m owner --gid-owner groupname -j MARK --set-mark 42 Afterwards we tell iptables to to some SNAT and tell ip route to use special routing table for marked traffic packets. Problem: if the VPN failes, there is a chance that the special to-be-tunneled program communicates over the normal eth0 interface. Desired solution: All marked traffic should not be allowed to go directly through eth0, it has to go through tun0 first. I tried the following commands which didn't work: iptables -A OUTPUT -m owner --gid-owner groupname ! -o tun0 -j REJECT iptables -A OUTPUT -m owner --gid-owner groupname -o eth0 -j REJECT It might be the problem, that the above iptable-rules didn't work due to the fact, that the packets are first marked, then put into tun0 and then transmitted by eth0 while they are still marked.. I don't know how to de-mark them after in tun0 or to tell iptables, that all marked packet may pass eth0, if they where in tun0 before or if they going to the gateway of my VPN provider. Does someone has any idea to a solution? Some config infos: iptables -nL -v --line-numbers -t mangle Chain OUTPUT (policy ACCEPT 11M packets, 9798M bytes) num pkts bytes target prot opt in out source destination 1 591K 50M MARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 MARK set 0x2a 2 82812 6938K CONNMARK all -- * * 0.0.0.0/0 0.0.0.0/0 owner GID match 1005 CONNMARK save iptables -nL -v --line-numbers -t nat Chain POSTROUTING (policy ACCEPT 393 packets, 23908 bytes) num pkts bytes target prot opt in out source destination 1 15 1052 SNAT all -- * tun0 0.0.0.0/0 0.0.0.0/0 mark match 0x2a to:VPN_IP ip rule add from all fwmark 42 lookup 42 ip route show table 42 default via VPN_IP dev tun0

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• Domain workstation acting up and I can't track it down.

  - by DevNULL

  I have a developer with a Windows XP (SP2) 64 bit machine. If the machine is left on overnight (or any period of time longer than 5-6 hours) it takes 2-3 minutes to open any local drive and his network drives are no longer accessible. Here's what the system logs report... Any Help BTW: The problem just started a week ago and nothing has changed on the domain controller / AD or his machine. --- ERROR 1 Event Type: Error Event Source: NETLOGON Event Category: None Event ID: 5719 Date: 6/8/2010 Time: 9:17:26 AM User: N/A Computer: BFC1 Description: This computer was not able to set up a secure session with a domain controller in domain UR due to the following: There are currently no logon servers available to service the logon request. This may lead to authentication problems. Make sure that this computer is connected to the network. If the problem persists, please contact your domain administrator. ADDITIONAL INFO If this computer is a domain controller for the specified domain, it sets up the secure session to the primary domain controller emulator in the specified domain. Otherwise, this computer sets up the secure session to any domain controller in the specified domain. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 5e 00 00 c0 ^..A --- ERROR 2 The machine-default permission settings do not grant Local Activation permission for the COM Server application with CLSID {555F3418-D99E-4E51-800A-6E89CFD8B1D7} to the user NT AUTHORITY\LOCAL SERVICE SID (S-1-5-19). This security permission can be modified using the Component Services administrative tool. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. --- ERROR 3 Event Type: Error Event Source: RemoteAccess Event Category: None Event ID: 20106 Date: 6/8/2010 Time: 10:12:18 AM User: N/A Computer: BFC1 Description: Unable to add the interface {E76F0A78-7A0B-4EBB-A081-BA3BD452FC4C} with the Router Manager for the IP protocol. The following error occurred: Cannot complete this function. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: eb 03 00 00 e...

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• Varnish returning 503, FetchError (could not get storage)

  - by Archan

  On the current setup we're running into a problem with Varnish, we're running a CentOS 5.7 x86_64 xenpv, with Cpanel WHM, hosted at VPS.net. Sometimes we will recieve a Guru Meditation from Varnish, and when we look in the varnishlog with the following command varnishlog -d -c -m TxStatus:503 it returns output similar to the following: 15 VCL_call c recv 15 VCL_acl c NO_MATCH devs 15 VCL_return c pass 15 VCL_call c hash 15 Hash c **** 15 Hash c ************* 15 VCL_return c hash 15 VCL_call c pass pass 15 Backend c 12 default default 15 TTL c 1835862523 RFC 0 -1 -1 1332454056 0 1332454055 375007920 0 15 VCL_call c fetch hit_for_pass 15 ObjProtocol c HTTP/1.1 15 ObjResponse c OK 15 ObjHeader c Date: Thu, 22 Mar 2012 22:07:35 GMT 15 ObjHeader c Server: Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8e-fips-rhel5 mod_bwlimited/1.4 mod_fcgid/2.3.6 15 ObjHeader c X-Powered-By: PHP/5.3.9 15 ObjHeader c Expires: Thu, 19 Nov 1981 08:52:00 GMT 15 ObjHeader c Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 15 ObjHeader c Pragma: no-cache 15 ObjHeader c Content-Type: text/html; charset=utf-8 15 ObjHeader c X-Cacheable: NO:Cache-Control=private 15 FetchError c chunked read_error: 12 (Could not get storage) 15 VCL_call c error deliver 15 VCL_call c deliver deliver As far as I have could gather, we could try increasing the nuke_limit, but currently we have a nuke_limit of 500, and when running varnishstat -1 -f n_lru_nuked we "only" get a total of 1031, even though we have seen the error happen on several pages. When we then run top to see how much memory Varnish is using, it only shows that it is using 763m, although we've set it to be allowed to use 1200m. Any ideas of what the problem can be?

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• Colorizing your terminal and shell environment?

  - by Stefan Lasiewski

  I spend most of my time working in Unix environments and using Terminal emulators. I try to use color on the commandline, because color makes the output more useful and intuitive. What are some good ways to add color to my terminal environment? What tricks do you do? What pitfals have you encountered? Unfortunately, support for color is wildly variable depending on terminal type, OS, TERM setting, utility, buggy implementations, etc. Here's what I do currently, after alot of experimentation: I tend to set 'TERM=xterm-color', which is supported on most hosts (but not all). I work on a number of different hosts, different OS versions, etc. I'm trying to keep things simple and generic, if possible. Many OSs set things like 'dircolors' and by default, and I don't want to modify this everywhere. So I try to stick with the defaults. Instead tweak my Terminal's color configuration. Use color for some unix commands (ls, grep, less, vim) and the Bash prompt. These commands seem to the standard "ANSI escape sequences" I've managed to find some settings which are widely supported, and which don't print gobbledygook characters in older environments (even FreeBSD4!) (For the most part). From my .bash_profile ### Color support # The Terminal application typically does 'export TERM=term=color' # Some terminal types will print Black, White & underlined with these settings. OS=`uname -s` case "$OS" in "SunOS" ) # Solaris9 ls doesn't allow color, so use special characters instead. LS_OPTS='-F' ;; "Linux" ) # GNU tools supports colors! See dircolors to customize colors export LS_OPTS='--color=auto' # Color support using 'less -R' alias less='less --RAW-CONTROL-CHARS' alias ls='ls ${LS_OPTS} export GREP_OPTIONS="--color=auto" ;; "Darwin"|"FreeBSD") # Most FreeBSD & Apple Darwin supports colors # LS_OPTS="-G" export CLICOLOR=true alias less='less --RAW-CONTROL-CHARS' export GREP_OPTIONS="--color=auto" ;; esac

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• Preventing DDOS/SYN attacks (as far as possible)

  - by Godius

  Recently my CENTOS machine has been under many attacks. I run MRTG and the TCP connections graph shoots up like crazy when an attack is going on. It results in the machine becoming inaccessible. My MRTG graph: mrtg graph This is my current /etc/sysctl.conf config # Kernel sysctl configuration file for Red Hat Linux # # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 1 # Controls whether core dumps will append the PID to the core filename # Useful for debugging multi-threaded applications kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Controls the maximum size of a message, in bytes kernel.msgmnb = 65536 # Controls the default maxmimum size of a mesage queue kernel.msgmax = 65536 # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 net.ipv4.conf.all.rp_filter = 1 net.ipv4.tcp_syncookies = 1 net.ipv4.icmp_echo_ignore_broadcasts = 1 net.ipv4.conf.all.accept_redirects = 0 net.ipv6.conf.all.accept_redirects = 0 net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.all.accept_source_route = 0 net.ipv4.conf.all.rp_filter = 1 net.ipv4.tcp_max_syn_backlog = 1280 Futher more in my Iptables file (/etc/sysconfig/iptables ) I only have this setup # Generated by iptables-save v1.3.5 on Mon Feb 14 07:07:31 2011 *filter :INPUT ACCEPT [1139630:287215872] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [1222418:555508541] Together with the settings above, there are about 800 IP's blocked via the iptables file by lines like: -A INPUT -s 82.77.119.47 -j DROP These have all been added by my hoster, when Ive emailed them in the past about attacks. Im no expert, but im not sure if this is ideal. My question is, what are some good things to add to the iptables file and possibly other files which would make it harder for the attackers to attack my machine without closing out any non-attacking users. Thanks in advance!

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• PHP 5.4.9 Mysqli issue

  - by Vitaly

  On Ubuntu 12.04 server I had PHP 5.4.9 installed from the source: ./configure --prefix=/etc/php --with-apxs2=/etc/apache2/bin/apxs --with-config-file-path=/etc/php --with-config-file-scan-dir=/etc/php/conf.d --with-libxml-dir=/usr/local/libxml2 --with-xsl=/usr/local/libxslt --with-mysql --with-zlib --with-pdo-mysql --enable-calendar --with-gd --with-iconv-dir --enable-mbstring --enable-soap --enable-sockets --enable-zip --with-curl --with-openssl --with-kerberos --with-tidy' Then, using apt-get, I had mysql server and phpMyAdmin installed. Unfortunatelly phpMyAdmin keep saying that 'mysqli' and 'mcrypt' not installed. php -m | grep mysqli just confirms it. So I tried to install mysqli with "apt-get install php5-mysqli", but just got message to do it by means of "php5-mysqlnd" or "php5-mysql". Even though they are already installed (according to phpinfo()) I tried - doesn't work. However, in php.ini, there's mysqli staff like "extension=php_mysqli.dll", but no "extension=mysqli.so". And block [MySQLi] with some uncommented settings also present. Since this is my first attempt to build php from source I reckon I did some silly mistake. Any help is greatly appreciated.

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• Does IIS Sometimes Allocate More Worker Processes Than Configured?

  - by Paul Williams

  We have an IIS 7.5 web service on Windows Server 2008 that handles WCF requests from C# clients. This service is configured to have Maximum Worker Processes = 1, so it is not a web garden. IIS is setup to recycle itself at the same time every day (3 AM). I am trying to debug gnarly connection issues, so I wanted to be sure the application pool was not recycling itself. I configured the pool to log an event when it recycles itself. To my surprise, I see the following entries in the System event log: Level: Information Date/Time: 3/23/2012 3:00:00 AM - Source: WAS - Event ID: 5076 A worker process with process id of '6636' serving application pool 'MyAppPool' has requested a recycle because it reached its scheduled recycle time. Level: Information Date/Time: 3/23/2012 2:59:39 AM - Source: WAS - Event ID: 5076 A worker process with process id of '9364' serving application pool 'MyAppPool' has requested a recycle because it reached its scheduled recycle time. IIS is correctly recycling the application pool at 3 AM. However, I do not understand why I would be getting two recycle events in the log within a few seconds of each other. The maximum number of processes is 1. Does IIS sometimes allocate multiple processes for an application pool that is specified as having 1 process? -- edit -- I connected at about 4 PM today and only saw 1 w3wp.exe process. There are no other event log entries that would indicate a crash.

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• CentOS 5 VPN Server won't work

  - by Miro Markarian

  I have a CentOS 5 server configured to be both a L2TP server and a PPTP server + a radius server for hosting the AAA. My problem is that, the L2TP works great and I can connect to it, but can't connect to PPTP and every-time it ends up with error #619 when it gets to the verifying username and password section. Here is the log I got from /var/log/messages Dec 17 07:40:02 serverdl pptpd[8570]: CTRL: Client 5.52.247.62 control connection started Dec 17 07:40:03 serverdl pptpd[8570]: CTRL: Starting call (launching pppd, opening GRE) Dec 17 07:40:03 serverdl pppd[8571]: Plugin radius.so loaded. Dec 17 07:40:03 serverdl pppd[8571]: RADIUS plugin initialized. Dec 17 07:40:03 serverdl pppd[8571]: Plugin radattr.so loaded. Dec 17 07:40:03 serverdl pppd[8571]: RADATTR plugin initialized. Dec 17 07:40:03 serverdl pppd[8571]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded. Dec 17 07:40:03 serverdl pppd[8571]: pptpd-logwtmp: $Version$ Dec 17 07:40:03 serverdl pppd[8571]: pppd 2.4.4 started by root, uid 0 Dec 17 07:40:03 serverdl pppd[8571]: Using interface ppp0 Dec 17 07:40:03 serverdl pppd[8571]: Connect: ppp0 <--> /dev/pts/2 Dec 17 07:40:03 serverdl pptpd[8570]: GRE: read(fd=7,buffer=80515e0,len=8260) from network failed: status = -1 error = Protocol not available Dec 17 07:40:03 serverdl pptpd[8570]: CTRL: GRE read or PTY write failed (gre,pty)=(7,6) Dec 17 07:40:03 serverdl pppd[8571]: Modem hangup Dec 17 07:40:03 serverdl pppd[8571]: Connection terminated. Dec 17 07:40:03 serverdl pppd[8571]: Exit. Dec 17 07:40:03 serverdl pptpd[8570]: CTRL: Client 5.52.247.62 control connection finished Just yesterday when I hadn't set up the L2TP yet PPTP was working great but then I uninstalled it and removed all it's config from /etc/* and installed L2TP first and then installed PPTP after it. and then it stopped to work. I believe it must be a radiusclient issue because both of the PPTP and L2TP services use radius to authenticate. And another thing I think must be the issue is that when assigning IPs to the PPP interfaces, I have done the following config. Is that right? For L2TP: localip 10.10.10.1 remoteip 10.10.10.2-254 For PPTP: localip 10.10.9.1 remoteip 10.10.9.2-254

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• How to have a shell script available everywhere I SSH to

  - by aib

  I have a shell script which I simply cannot do without: bar from Theiling Online I use SSH a lot and on a variety of *nix servers. However, I am not a system administrator and usually don't have the time or privileges to install it on every server I connect to. It is apparently a very portable sh script and has command line options to export itself as a shell function, which got me thinking: Could I use one of OpenSSH's subjectively obscure features to export it everywhere I go? My first thought was to assign the source to an environment variable like BAR = "cat -v" and then execute it on the other side as `$BAR`, but 1) I can't even get the cat example to to work locally, 2) I don't know how to put the script's actual multiline source into an environment variable and 3) I have yet to see a machine with PermitUserEnvironment enabled. I guess I could even do with an ssh option to write a file called ~/bar at logon, but a more volatile solution would be better. Calling wget http://.../bar at logon would be unacceptable. Any ideas? P.S. Putty-specific solutions, though I doubt any would exist, are also fine.

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• Unable to logon using terminal server connection

  - by satch

  I have several W2K3 SP2 servers, admin TS enabled. I discovered this morning, I was unable to logon into some of them. I've a couple of Citrix servers in different farms, a SAP (IA64) app server and a cvs server. All of them show same sympthoms; remote connections are refused. I've been able to logon locally, and terminal server service is up, there are no users (so connections are not depleted). There are no errors in log in most servers. One of the Citrix ones, reported following errors: Event ID 50 Source TermDD Type Error Description The RDP protocol component X.224 detected an error in the protocol stream and has disconnected the client. and Event ID 1006 Source TermService Type Error Description The terminal server received large number of incomplete connections. The system may be under attack. Anyway, I suppose these errors appear because server isn't working, and Citrix users try to logon massively. (I nmap'ed server and port seems up). I've solved this problem rebooting before, but with so many servers affected it seems like a crappy workaround. Any idea about troubleshooting it properly? Thanks in advance

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• Forward secrecy in Nginx (CentOS6)

  - by Anil

  I am trying to enable Forward secrecy in CentOS with nginx webserver. What I have tried I have read some tutorials and seems like we should have nginx, openssl latest versions to enable it. So I had installed the openssl latest from source. sudo wget http://www.openssl.org/source/openssl-1.0.1e.tar.gz sudo tar -xvzf openssl-1.0.1e.tar.gz cd openssl-1.0.1e sudo ./config --prefix=/usr/local sudo make sudo make install Now OpenSSL supports the Eliptic Curve ciphers(ECDHE). I tested this with openssl s_server also. It worked well. Next, I replaced Nginx with latest. sudo wget http://nginx.org/packages/centos/6/x86_64/RPMS/nginx-1.4.2-1.el6.ngx.x86_64.rpm sudo rpm -e nginx sudo rpm -ivh nginx-1.4.2-1.el6.ngx.x86_64.rpm and configured Nginx as described in this link ssl_protocols TLSv1 TLSv1.1 TLSv1.2; ssl_prefer_server_ciphers on; ssl_ciphers EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA256:EECDH+aRSA+RC4:EDH+aRSA:EECDH:RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS; http://baudehlo.wordpress.com/2013/06/24/setting-up-perfect-forward-secrecy-for-nginx-or-stud/ But now Nginx does not support ECDHE ciphers. It supports DHE ciphers. I tried by just enabling ECDHE cipher in nginx still doesn't work. I am using latest web browser(chrome 29 and it support this cipher) Am i missing anything ? Or Having issues with CentOS or Nginx? I read somewhere that ECC patent issues with CentOS, is this causing problem?

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• Window 7 Host does not answer to ping

  - by gencha

  Today I tried printing on a shared printer on one of our homegroup members. Sadly it did not work (printer marked as offline). Shortly after, I noticed I can't even ping the machine that owns the printer (I also can not remotely access it in any other way I've tried). Currently I'm trying to ping the machine from the router both computers are connected to (and my machine in question doesn't answer). I do receive the echo requests (as verified with WireShark). I also added a rule in the Windows Firewall to specifically allow ICMP echo requests, but that didn't change anything. I also tried netsh firewall set icmpsetting 8 enable, but that didn't change anything either. Completely disabling the Windows Firewall has no effect on the issue either. One has to wonder, where does Windows log when and why it ignored any incoming packets? How can I get to the bottom of this? Here are some ways I found to dig deeper into the issue: Enabling logging on the Windows Firewall Enabling Windows Filtering Platform Auditing Both methods at least give more insight into the issue. The plain log file is full of entries like this: 2011-11-11 14:35:27 DROP ICMP 192.168.133.1 192.168.133.128 - - 84 - - - - 8 0 - RECEIVE So the ICMP packets are being dropped as if that was intended. The Event Viewer now gives a little bit more details: The Windows Filtering Platform has blocked a packet. Application Information: Process ID: 4 Application Name: System Network Information: Direction: Inbound Source Address: 192.168.133.1 Source Port: 0 Destination Address: 192.168.133.128 Destination Port: 8 Protocol: 1 Filter Information: Filter Run-Time ID: 214517 Layer Name: Receive/Accept Layer Run-Time ID: 44 This same entry is always repeated with 2 points of information changing: Process ID: 420 Application Name: \device\harddiskvolume2\windows\system32\svchost.exe The service host with the PID 420 is the host for the following services: Windows Audio DHCP Client Windows Event Log HomeGroup Provider TCP/IP NetBIOS Helper Security Center Additionally, there is currently this problem with the same machine: Even though my network is set to be a "Home network", I am unable to create a new homegroup.

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• Interesting phenomenom with Windows Server 2008 R2 user access controls and NTFS ACLs

  - by Simon Catlin

  One to try, and I'd appreciate any thoughts on this. On a Windows Server 2008 R2 box (or presumably 2008 R1, Windows Vista or Windows 7): i) Logon as an administrator, and create a new NTFS volume ii) Blow away the standard MS ACLS on the root of the volume (which are laughable), and replace with Administrators:Full Control, System:Full Control, e.g.: echo Y|cacls.exe d:\ /g "Administrators:F" "SYSTEM:F" iii) Now, from a Command Prompt shell window or PowerShell window, switch to that drive (cd /d D:\ or set-location D:\ ). Works fine... no issues. iv) Now, try to browse to the root of the new volume using MS Explorer... Access denied. Now, I've kind of convinced myself that it is UAC getting in the way, as you can add "Authenticated Users:List" access to D:\ and Explorer then works. I can only assume that MS Explorer isn't able to use the "admin" token for the Administrator. Browsing to explorer.exe and doing a "Run as administrator" has no effect. Any thoughts? Cheers in advance.

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• Access denied to external USB disk; update access rights fails in Windows 8

  - by gerard

  I use to work with 2 laptops (Windows vista and Windows 7), my work files being on an external usb disk. My oldest laptop broke down, so I bought a new one. I had no option other than take Windows 8. I suspect something changed with access rights, as my external disk suffered some "access denied" problem on Windows. I was prompted (by Windows 8) somehow to fix the access rights, which I tried to do, getting to the properties - security. This process was very slow and ended up saying disk is not ready Additionally, my external usb disk somehow was not recognized anymore. Back to Windows 7, I was warned that my disk needed to be verified, which I did. In this process, some files were lost (most of them I could recover from the folder found00x, but I have some backup anyway). Also, I don't know why, but under Windows 7, all the folder showed with a lock. Then back again to Windows 8. Same problem : access denied to my disk + no way to change access rights as it gets stuck disk is not ready". Now I am pretty sure there is some kind of bug or inconsistency in Windows 8 / Windows 7. I did 2. and 3. a few times. At some point, I also got an access denied in Windows 7. I could restore access rights to the disk to "System" (properties - security - EDIT for full control to group "system". ). But then I still get the same access right pb on Windows 8, and getting stuck in the process to restore full control to "system" -- and "admin" groups. I upgraded Windows8 with the Windows8 updates available. Does not help.

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