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• IIS / Virtual Directory authentication.

  - by Chris L

  I have an IIS(v6)/Windows 2003/.Net 3.5(app code, libraries etc.) server hosting a website at www.mywebsite.com mapped to E:\Inetpub\wwwroot\mywebsite, we also have a virtual directory (VirtDir) mapped out to E:\Inetpub\wwwroot\mywebsite\files (although in theory this could be in a different directory or a separate machine) where we store a customer's files(a bunch of .pdf & .xls). Currently to access a file you can enter into the url something like: www.mywebsite.com/VirtDir/Customer/myFile.pdf and get access to the file. The problem is the user doesn't have to log into www.mywebsite.com to get access to the file, we would prefer them to log in first. We would like the user to login via the mywebsite and if valid, let them download files from the virtual directory. The www.mywebsite.com and VirtDir are separate sites on the same farm. Allow Anon Access, and Integrated Windows Authentication both enabled. I'm more of a developer and less of a Sys Admin, but hopefully I'm in the right spot, any help would be appreciated.

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• DRBD setup problem

  - by cuthieu

  I'm so new to DRBD, please help me fixing the problem below. Enclosed my drbd.conf. Many thanks [root@skonkwerks1 ~]# drbdadm create-md all open(/dev/hdb3) failed: No such file or directory Command 'drbdmeta /dev/drbd0 v08 /dev/hdb3 internal create-md' terminated with exit code 20 drbdsetup exited with code 20 [root@skonkwerks1 ~]# vi /etc/drbd.conf global { usage-count no; } resource repdata { protocol C; startup { wfc-timeout 0; degr-wfc-timeout 120; } disk { on-io-error detach; } # or panic # net { cram-hmac-alg "hdd1"; shared-secret "testing"; } syncer { rate 10M; } on skonkwerks1 { device /dev/drbd0; disk /dev/hdb1; address 172.29.156.1:7788; meta-disk internal; } on skonkwerks2 { device /dev/drbd0; disk /dev/hdb1; address 172.29.156.2:7788; meta-disk internal; } }

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• Winamp playing sound but no video

  - by Greg Sansom

  I am having problems playing video in Winamp (the movie I am trying to play is an AVI - not sure if other formats work). I have installed the K-Lite Codec Pack, and the video does work in Winamp Classic. I can also play the video in Winamp on another machine (although I can't remember the exact configuration details of that machine - and I don't think they're relevant). There are a few symptoms: The content of the Video view is either empty, transparent, or displays rendering from other programs. Opening the Visualization view shows the following error: MILKDROP ERROR DirectX initialization failed (GetDeviceCaps). This means that no valid 3D-accelerated display adapter could be found on your computer. If you know this is not the case, it is possible that your graphics subsystem is unstable; please try rebooting your computer and then try to run the plugin again. Otherwise, please install a 3D-accelerated display adapter. Trying to open streams via the SHOUTCast TV plugin shows Error opening video output, and the video does not open. Opening the file with WMC causes the following error (although the movie still plays): Error creating DX9 allocation presenter CreateDevice failed D3DERR_NOTAVAILABLE There are no warnings displayed in Device Manager, although the display adapter is the standard Windows one. Running DxDiag shows no problems (codec for Video listed as XviD 1.1.2 Final). GSpot reports that codecs are installed. System specs: - Windows Server 2008 r2 Standard 64-bit, with latest updates; - .NET 3.5.1 installed; - Winamp v5.6.01 (latest version); - DirectX 11 (Latest version); - K-Lite Codec Pack 7.0.0 (Full); - Machine is HP DC7600 - full specs here. Please comment if there is any more information which will help to diagnose the problem.

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• ntpdate cannot receive data

  - by Hengjie

  I have a problem where running ntpdate on my server doesn't return any data therefore I get the following error: [root@server etc]# ntpdate -d -u -v time.nist.gov 12 Apr 01:10:09 ntpdate[32072]: ntpdate [email protected] Fri Nov 18 13:21:21 UTC 2011 (1) Looking for host time.nist.gov and service ntp host found : 24-56-178-141.co.warpdriveonline.com transmit(24.56.178.141) transmit(24.56.178.141) transmit(24.56.178.141) transmit(24.56.178.141) transmit(24.56.178.141) 24.56.178.141: Server dropped: no data server 24.56.178.141, port 123 stratum 0, precision 0, leap 00, trust 000 refid [24.56.178.141], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 14:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 14:28:16.000 transmit timestamp: d3303975.1311947c Thu, Apr 12 2012 1:10:13.074 filter delay: 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 filter offset: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 delay 0.00000, dispersion 64.00000 offset 0.000000 12 Apr 01:10:14 ntpdate[32072]: no server suitable for synchronization found I have tried Googling the 'no server suitable for synchronization found' error online and I have tried disabling my firewall (running iptables -L returns no rules). I have also confirmed with my DC that there are no rules that are blocking ntp (port 123). Does anyone have any ideas on how I may fix this? Btw, this is what the output should look like on a working server in another DC: 11 Apr 19:01:24 ntpdate[725]: ntpdate [email protected] Fri Nov 18 13:21:17 UTC 2011 (1) Looking for host 184.105.192.247 and service ntp host found : 247.conarusp.net transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) receive(184.105.192.247) transmit(184.105.192.247) server 184.105.192.247, port 123 stratum 2, precision -20, leap 00, trust 000 refid [184.105.192.247], delay 0.18044, dispersion 0.00006 transmitted 4, in filter 5 reference time: d330364e.e956694f Wed, Apr 11 2012 18:56:46.911 originate timestamp: d3303765.8702d025 Wed, Apr 11 2012 19:01:25.527 transmit timestamp: d3303765.73b213e3 Wed, Apr 11 2012 19:01:25.451 filter delay: 0.18069 0.18044 0.18045 0.18048 0.18048 0.00000 0.00000 0.00000 filter offset: -0.00195 -0.00197 -0.00211 -0.00202 -0.00202 0.000000 0.000000 0.000000 delay 0.18044, dispersion 0.00006 offset -0.001970

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• Site hanging in iis7 - how do I troubleshoot?

  - by Chris Foot

  I am currently having a problem with a windows 2008 server running IIS 7. The server runs several sites but only seems to have the issue with one particular site. Every so often, the whole server slows to a crawl with nearly all requests timing out! Invariably, when we log in to take a look there is always an IIS process using up around 90% cpu. Looking into the worker processes in IIS there are usually one or two requests that have been running for a long time. They are always in the ExecuteRequestHandler state with ManagedPipeline as the module name and the current ones i'm looking at have been running for 7686248 (what units is this in, it doesn't say?). It is also not always the same page, in fact we have seen at least 3 different pages listed under url when this has happened. It seems that the only way to bring the server back to life is to kill the 90% process! The site is running under .Net 4.0 and the code on it is very similar to other sites on the server which do not have the problem! How do I start troubleshooting this?

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• Setup a Reverse Proxy with Nginx and Apache on EC2

  - by heavymark

  Good Day, I am currently using the free Amazon EC2 micro instance to learn Linux and server setup. I wish to setup Nginx as a reverse web proxy. I found a great article on mediatemple on how to do it: http://wiki.mediatemple.net/w/Using_Nginx_as_a_Reverse_Web_Proxy The directions work for most any server except for EC2.One difference between EC2 and MediaTemple is how IPs work. Overall EC2 instances do not know their elastic IP. So when following the wiki directions in the virtual hosts for instance instead of myip:80 for instance I put *:80. When just using Apache this works perfectly. In the apache virtual hosts I did "127.0.0.1:80" and in the Nginx I put *:80. Apache restarts, by Nginx provides an error that it cannot bind because the ip is already in use. If I could add an actual IP in the Nginx file it would work but since EC2 requires me to put in the asterisk it ends up conflicting with the apache virtual hosts entry. Anyone know a simple way around this (other than not using EC2) ;-) Thank you! Cheers, Christopher

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• how to setup a bridge with 2 NICs and few virtual machines

  - by Bond

  Here is my situation. I have a server with 2 NICs. I have installed virtual box and I have created a few Guest Operating Systems on it. I want these Virtual Machines to be using a bridge.NIC2 would be used to setup this bridge and NIC1 would be connected to corporate network.I am not clear with how should I go on doing this. /etc/network/interfaces is the file which I am trying to modify etc. My approach is following 1) Define a configuration file /etc/network/interfaces 2) Create IPTABLES as how NIC1 will forward the packets to Bridge on NIC2 Now comes the problem I do not understand what is the meaning of following lines in the configuration file auto lo iface lo inet loopback # The primary network interface auto eth2 iface eth2 inet manual auto br0 iface br0 inet static address 192.168.1.14 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.10 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers 192.168.13.2 dns-search myserver.net bridge_ports eth2 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off So any pointers to what should be the entries of /etc/network/interfaces file. So that I understand which parameter is to be used when and where that would help me.

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• Should tripwire be entering /proc?

  - by dsadinoff

  When initializing the db with tripwire --init it spat out a bunch of errors pertaining to /proc: ### Warning: File system error. ### Filename: /proc/16982/fd/4 ### No such file or directory ### Continuing... ### Warning: File system error. ### Filename: /proc/16982/fdinfo/4 ### No such file or directory ### Continuing... ### Warning: File system error. ### Filename: /proc/16982/task/16982/fd/4 ### No such file or directory ### Continuing... ### Warning: File system error. ### Filename: /proc/16982/task/16982/fdinfo/4 ### No such file or directory ### Continuing... ### Warning: Duplicate object encountered. ### /proc/sys/net/ipv6/neigh This feels like noise. The twpol.txt file has the following clause: # # Critical devices # ( rulename = "Devices & Kernel information", severity = $(SIG_HI), ) { /dev -> $(Device) ; /proc -> $(Device) ; } Which, if I understand it right, is going to cause tripwire to care deeply about the entire contents of /proc. Shouldn't it just care about the static parts of /proc like the drivers and such, and not the per-pid stuff? Why does it ship like this?

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• IP queue buffer

  - by summerbulb

  I seem to have an issue with IP queue. I have a linux machine that I am using to run some experiments. The linux machine is configured to be a router, having two NICs, connecting two other computers, and managing their network traffic. All incoming packages are captured, using iptables, and analyzed by a C application. The application analyzing the packets has a built-in delay, as part of the experiment. So I have one very fast computer sending packets through my linux-router and a (relatively) slow linux-router that analyses and deals with the packets, one by one. This situation leads to the fact that when I fire up a sender application on one of the computers connected to the linux-router, my IP queue on the linux-router gets filled up (almost) instantaneously. The IP queue's max length is currently set to 1024, and if it overflows, the packets are dropped. This is expected and i'm OK with it. But, (and this is where it gets interesting), every now and then I get the following error: "Failed to receive netlink message: No buffer space available" At start, I thought this was due to the IP queue overflow, but after some analysis i found that sometimes I get the error even if the IP queue buffer did not overflow, and sometime I DON'T get the message even though the buffer DID overflow. When I run > cat /proc/net/ip_queue, I get the following table (also used to monitor the IP queue overflow): Peer PID : 27389 Copy mode : 2 Copy range : 65535 Queue length : 0 Queue max. length : 1024 Queue dropped : 1166875 Netlink dropped : 2916 Looking at the last two values, Queue dropped seems to refer to packets that did not manage to get into the IP queue because the buffer was full. I can see this value rise as I bombard the linux-router. Netlink dropped ( as it's name implies :) ) seems to have to do with the error i'm getting. I did my best to search for material on this error, but wasn't able to find anything that seemed to point me in the required direction. Bottom line: Why am I getting this error and what can I do to avoid it?

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• Google account gives ERR_SSL_BAD_RECORD_MAC_ALERT errors

  - by Kjensen

  A couple of days ago, I started being unable to connect to accounts.google.com, which handles logins to all kinds of google services. I get this error in Chrome: Error 126 (net::ERR_SSL_BAD_RECORD_MAC_ALERT): Unknown error. In IE I get this: I assume it is the same error, just wrapped up. I run Win8 RTM. On the SAME machine, using the same network card, in a VMWare workstation image running Win7, I am able to connect perfectly. On another of my machines on my network, I am also still able to connect with no problem. My girlfriend uses the same network and has also complained a couple of times about this error (google calendar) - but this is anecdotal, since her technical troubleshooting abilities stop at "xxxx is broken". Her machine runs Win7. ;) I have rebooted, cleared cookies, do not run any antivirus/firewall, have not changed network config. The first 3-4 days after installing Win8, I did not have any problems. I have also searched, and found a hint about enabling SSL2.0 in connection settings, which did not help. Anybody know something about this error and what I can do to fix it?

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• Adding custom service to nagiosgraph

  - by ravloony

  I have successfully added nagiosgraph to our nagios installation. I also added a memory checker plugin, from here : http://blog.vergiss-blackjack.de/2010/04/nagios-plugin-to-check-memory-consumption/. However I can't seem to get the graph of this service to be output by nagiosgraph. The plugin returns a single line like this: 31% (3785 of 11903 MB) used so i added a rule like this to the map file: /output:(\d+)% \((\d+) of (\d+) MB\) used/ and push @s, ['Mem', ['Percentage', 'GUAGE', $1], ['Used', 'GUAGE', $2], ['Total', 'GUAGE', $3] ]; I have also read this : http://www.mail-archive.com/[email protected]/msg36835.html and made sure that process_performance_data=1 in the nagios conf file. So far I have no graph for the Mem service on any host, and no rrd file either. I am unsure how to proceed to get this working. The documentation is rather difficult to follow and I haven't managed yet to understand it enough to do this. Can anyone point me to a tutorial, or some documentation which explains the steps needed to get a service noticed and graphed by nagiosgraph?

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• How do I keep a bridge enabled on a bonded interface?

  - by jlawer

  I'm working on setting up a pair of CentOS 6.3 servers that will run a couple of KVM vms and have come across a problem setting up a bridge on a bond. I am using Mode 4 (802.3ad) bonding on a pair of stacked Dell Powerconnect 5524 switches connecting to R320 servers. There are 2 links (1 to each switch) that form a Link Aggregation Group (802.3ad / LACP bonding). On top of the bond I have VLAN Tagging. I've verified this is a problem on multiple other bonding modes so it isn't just a mode 4 issue. I am testing what happens when 1 link is dropped (ie switch dies, cable breaks, etc). If I don't have a bridge (for KVM), everything works fine, failover happens as expected. If I have the bridge enabled, it works fine until failover (unplugging a cable). When failover happens /var/log/messages shows the slave link going down, followed within a second by: kernel: br1: port 1(bond0.8) entering disabled state The thing is /proc/net/bonding/bond0 shows the link is up as expected (simply with only 1 slave instead of 2). If I plug the cable back in it recovers and brings the bridge back to an enabled state. I actually have tested this while a ping is occuring and if the timing is right a packet will actually leave the system after the link is lost, but before the disabled message occurs. This disabled state I assumed was STP, but I have disabled STP on the bridge configuration and this issue still occurs. brctl showstp br1 still shows the link as disabled when it is running without a slave. I also switched between the nics in the server (I have 2x Broadcom & 4x intel). It doesn't matter which configuration I have. Does anyone know of a way to force the bridge to stay enabled or why its detecting the bond as disabled, when it isn't?

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• Un-install network printer drivers from Win7 64 Home Premium

  - by AkkA

  I recently bought a NAS device that has print server functionality through USB. The printer was already installed and fully working on another Win XP box, set up that box to see the printer over the network and it prints fine. I tried to install the printer on my Win7 laptop (64 bit, Home Premium), but got the wrong drivers somehow, or it just refuses to work. I need to completely un-install the printer drivers and start from scratch. Removing the printer (by going to the printers folder, right click and remove) does not actually un-install the drivers. It only removes the printer from active use. Even if I try to re-install new drivers it will load the old ones. I have read a few things on the net that say to load up a device snap-in or something of the sort into Computer Management, but this seems to be valid for Win7 Pro or greater, the function everyone tells you to use isnt available in Home Premium. Is there anything I can use to manage device driver files in Home Premium? I want to completely remove them from the computer.

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• How to automatically restart Apache service after HTTP 503 error?

  - by Gnanam

  Our production server is running Apache v2.2.4 on CentOS5.2. Mono v1.2.4 is integrated within Apache. Recently, we faced a problem in our production server. From Apache's access_log, I found a HTTP 500 internal server error for one of the HTTP request and all subsequent HTTP requests also failed but with HTTP 503 service unavailable error. From thereafter, none of the requests were successful. Also, only later some time, we realized that our application was not working because of this error and then we restarted Apache service. My questions are, in this kind of situation, how do I automatically restart Apache service when HTTP 503 error is encountered? Is there any Apache directive available to set? in general, what would cause a HTTP 503 error in Apache? NOTE: Mono helps in running applications developed in .NET on a Linux-based OS. EDIT: I agree on finding the root cause of this problem. In fact, we've been analyzing that too. Till we resolve it, am finding whether this could be restarted immediately on its own without having any downtime/service disruption for application users.

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• Vista won't boot. BSOD: Page fault in nonpaged area

  - by user31576

  Here's the story: I let Windows Update do the updates it wanted to do, then rebooted the computer. The updating process was taking time so I went away. When I came back, my computer was rebooting. It got as far as the Windows logo with the laoding bar. BSOD'd. Rebooted. And I'm stuck in this loop ever since. Looked up on the net, the "Page fault in nonpaged area" seems to be linked to faulty RAM or drivers. So I ran a memory test, it found no error. When I try in safe mode (with promt) I can see a list of drivers being loaded, then I get the same BSOD. I tried to repair using the Vista DVD, it says "nothing to repair". I tried to restore to a previous state, it says "no restore point found". So, my guess is, it's got something to do with the drivers. How can I identify the one causing the BSOD? If you have any other leads, What can I do? By the way, I'm writing from this very computer, running a linux distro I installed after the BSOD loop started. So i guess it's not an hardware issue. I have backed up important data, and will format and reinstall Windows if I must. But I'd like to avoid that. Thanks in advance for any help you can give me.

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• Linux/hostapd: AP can ping clients, clients can access internet, can't access www@wlan1 with more than 5-6 packets at once

  - by mhambra

  Please edit the title, can't make it sound better. -- OP. Hi all, I have a Wifi USB dongle in a PC, that serves as an AP for laptop. wlan1: 192.168.2.1, netmask 255.255.255.0, routed: route add -net 192.168.2.0 netmask 255.255.255.0 gw 192.168.2.1 ping 192.168.2.2 (laptop): ping was ok for lot of packets. Now, I try to access 192.168.2.1:80/myindex.html (apache) from laptop, and can see that own 1kb test page. But, trying to access 192.168.2.1:80/my.jpg, I see the following: GET /my.jpg HTTP/1.1 200 OK <jpg header, about a kilobyte> <TCP packet retransmisson> <TCP packet retransmisson> <end of stream> It seems to be a hostapd's problem (networked stuff worked fine with Ad-Hoc), but it may be also forwarding/routing problem too. What to google for? Even more strange, SSH to that host works fine.

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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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• Traceroute to IP address fails, but traceroute to domain name with same IP address is okay. Why?

  - by tomo

  When I traceroute to this IP (108.162.198.181) it stops after 1 hop. But tracerouting to a domain (www.gomodule.com) with the same IP shows 9 hops ending in that target. traceroute to www.gomodule.com (108.162.198.81), 64 hops max, 52 byte packets 1 192.168.1.1 (192.168.1.1) 131.667 ms 48.532 ms 48.837 ms 2 118.69.255.124 (118.69.255.124) 91.521 ms 79.177 ms 30.679 ms 3 42.117.11.225 (42.117.11.225) 30.270 ms 32.091 ms 29.698 ms 4 118.69.253.213 (118.69.253.213) 32.234 ms 118.69.253.237 (118.69.253.237) 70.667 ms 118.69.253.213 (118.69.253.213) 82.440 ms 5 118.69.253.245 (118.69.253.245) 64.554 ms 80.277 ms 130.224 ms 6 118.69.251.205 (118.69.251.205) 65.635 ms 118.69.249.78 (118.69.249.78) 133.234 ms 118.69.251.205 (118.69.251.205) 224.111 ms 7 118.69.251.249 (118.69.251.249) 156.679 ms 111.965 ms 64.165 ms 8 cloudflare1-rge.hkix.net (202.40.160.246) 64.102 ms 64.498 ms 74.581 ms 9 108.162.198.81 (108.162.198.81) 66.873 ms 67.426 ms 69.054 ms -vs- traceroute to 108.162.198.181 (108.162.198.181), 64 hops max, 52 byte packets 1 192.168.1.1 (192.168.1.1) 96.588 ms 3.003 ms 4.976 ms 2 118.69.255.124 (118.69.255.124) 45.223 ms 31.449 ms 31.225 ms 3 * * * 4 * * * 5 * * * 6 * * * 7 * * * 8 * * * 9 * * * 10 * * * ...

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• Routing table on Linux not respected

  - by MRHaarmann

  I have a very specific problem, building a Linux VPN endpoint (with external VPN Gateway), which should route certain networks over the tunnel, others via default gateway. The Linux VPN should do a NAT on the outgoing connections for the VPN peers. Setup is as following: Internet gateway LAN 192.168.25.1/24 VPN Gateway LAN 10.45.99.2/24 (VPN tunnel 10.45.99.1 to net 87.115.17.40/29, separate connection to Internet) Linux VPN Router eth0 192.168.25.71/24 eth0:503 10.45.99.1/24 Default 192.168.25.1 route to 87.115.17.40/29 via 10.45.99.2 (send_redirects disabled, ip_forward enabled) Linux clients (multiple): eth0 192.168.25.x/24 Default 192.168.25.1 route to 87.115.17.40/29 via 192.168.25.71 Ping to the machines via tunnel from the VPN Router is working. Now I want to establish a routing from my clients over the VPN gateway and the client packet gets routed to 192.168.25.1 ! traceroute output shows the packets get routed to 192.168.25.71, but then to 192.168.25.1. So the route is not respected in forward ! IPTables and Routing: ip route show 87.115.17.40/29 via 10.45.99.2 dev eth0 10.45.99.0/24 dev eth0 proto kernel scope link src 10.45.99.1 192.168.25.0/24 dev eth0 proto kernel scope link src 192.168.25.71 default via 192.168.25.1 dev eth0 iptables -A INPUT -i eth0:503 -j REJECT iptables -t nat -A POSTROUTING -o eth0:503 -j MASQUERADE iptables -A FORWARD -i eth0:503 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -s 192.168.25.0/24 -o eth0:503 -j ACCEPT So what is wrong with my setup ? The route is chosen correctly from localhost, but all the clients get forwarded to the Internet GW. thanks for helping, Marcus

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• Amazon EC2 Nat Instance - goes out but not back in

  - by nocode

  I've followed Amazon's steps and list what I've done. I've created 6 subnets (4 private SN1: 10.50.1.0/24, SN2: 10.50.2.0/24, SN3: 10.50.3.0/24, SN4: 10.50.4.0/24) and 2 public (SN5: 10.50.101.0/24 and SN6: 10.50.102.0/24) -I have a Bastion host and a NAT instance on SN5 and assigned EIP's to both. I created a test instance on SN1. edit: -NAT instance has source/destination check disabled -On the NAT instance, I had enabled the following commands to be bootstrapped: echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 10.0.0.0/16 -j MASQUERADE -In my VPC, the private subnets have their own route table and configured 0.0.0.0/0 to the NAT instance with 4 subnets being associated with the route table. I have a second route table for my public subnets and 0.0.0.0/16 is pointed towards the IGW (with the other 2 subnets associated with it). -For Security Groups, I have the NAT instance accepting all traffic on each of the 4 subnets and all OUTBOUND traffic is allowed. For my test server, I have allowed all outbound access and have allowed all traffic from the public subnet of the NAT host. I can ping internally with no issues. On my test instance, if I try to ping google.com, DNS resolves however I don't get a reply back. On my NAT instance, I run a tcpdump and can see the request being requested to google.com but it's not sending the reply back. My NAT host can ping and receive a reply from google. From the test host, when I ping the NAT instance, the tcpdump shows a request and receive. Is there something I'm missing? EDIT: I've figured it out - I had to save the iptable config and restart the service.

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• Exchange 2010 CAS Removal == Broken???

  - by Doug

  Hi there, I recently upgraded to exchange 2010 and have a setup with 2 of my servers running CAS roles - EXCH01, EXCH02 EXCH02 just happens to also have a mailbox role where a lot of the users sit EXCH01 is my front facing CAS server, and is facing the net with SSL etc and incoming mail moving through it as a hub transport layer server as well. As i was trying to lean things out in my VM environment i removed the CAS role from EXCH02 and all hell broke loose. All the mail users that have a mailbox on EXCH02 had their homeMTA set to a deleted items folder in AD and so did their msExchHomeServer properties. After a complete battle i manually fixed these issues to the oldvalues, and in the mean time reinstalled CAS on EXCH02 (management was going nuts with out OUTLOOK working so i just put things back the way they were in a hurry.) I must add as a strange thing on the side, that before i reset these to point at EXCH02 i tried EXCH01 and it failed. I still want to remove the CAS role from EXCH02 as it should really not have it (error on install/planning on my part) and would have thought that this would not cause the issues it did, i assumed that the fact that there was another CAS server in the admin group all would be good. Was i wrong in my assumption? and what can i do to complete this successfully the second time round? Do i need to rehome all the mailboxes to the CAS server? is this a bug in the role uninstall?

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• Postfix message ID originating process?

  - by Anders Braüner Nielsen

  Last night my postfix mail server(Debian Squeeze with dovecot, roundcube, opendkim and spamassassin enabled) started sending out spam from a single domain of mine like these: $cat mail.log|grep D6930B76EA9 Jul 31 23:50:09 myserver postfix/pickup[28675]: D6930B76EA9: uid=65534 from=<[email protected]> Jul 31 23:50:09 myserver postfix/cleanup[27889]: D6930B76EA9: message-id=<[email protected]> Jul 31 23:50:09 myserver postfix/qmgr[7018]: D6930B76EA9: from=<[email protected]>, size=957, nrcpt=1 (queue active) Jul 31 23:50:09 myserver postfix/error[7819]: D6930B76EA9: to=<[email protected]>, relay=none, delay=0.03, delays=0.02/0/0/0, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta5.am0.yahoodns.net[66.196.118.33] while sending RCPT TO) The domain in question did not have any accounts enabled but only a catchall alias set through postfixadmin - most emails were send from a specific address I use frequently but some were also sent from bogus addresses. None of the other virtual domains handled by postfix were affected. How can I find out what process was feeding postfix/sendmail or more info on where they originated? As far as I can tell php mail() wasn't used and I've run several open relay tests. I did a little tinkering(removed winbind from the server and ipv6 addresses from main.cf) after the attack and it seems to have subsided but I still have no idea how my server was suddenly sending out spam. Maybe I fixed it - maybe I didn't. Can anyone help figuring out how I was compromised? Anywhere else I should look? I've run Linux Malware Detect on recently changed files but nothing found.

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• Correct use of SMTP "Sender" header?

  - by Eric Rath

  Our web application sends email messages to people when someone posts new content. Both sender and recipient have opted into receiving email messages from our application. When preparing such a message, we set the following SMTP headers: FROM: [email protected] TO: [email protected] SENDER: [email protected] We chose to use the author's email address in the FROM header in an attempt to provide the best experience for the recipient; when they see the message in their mail client, the author is clear. To avoid the appearance of spoofing, we added the SENDER header (with our own company email address) to make it clear that we sent the message on the author's behalf. After reading RFCs 822 and 2822, this seems to be an intended use of the sender header. Most receiving mail servers seem to handle this well; the email message is delivered normally (assuming the recipient mailbox exists, is not over quota, etc). However, when sending a message FROM an address in a domain TO an address in the same domain, some receiving domains reject the messages with a response like: 571 incorrect IP - psmtp (in reply to RCPT TO command) I think this means the receiving server only saw that the FROM header address was in its own domain, and that the message originated from a server it didn't consider authorized to send messages for that domain. In other words, the receiving server ignored the SENDER header. We have a workaround in place: the webapp keeps a list of such domains that seem to ignore the SENDER header, and when the FROM and TO headers are both in such a domain, it sets the FROM header to our own email address instead. But this list requires maintenance. Is there a better way to achieve the desired experience? We'd like to be a "good citizen" of the net, and all parties involved -- senders and recipients -- want to participate and receive these messages. One alternative is to always use our company email address in the FROM header, and prepend the author's name/address to the subject, but this seems a little clumsy.

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• I have enabled hidden administrator in Win 7 home, but programs still dont work.

  - by Angela

  I have Windows 7 Home Premium, and would like to do some maintenance tasks such as running Disk Defragmenter. However, this and other programs and applications that I'm accustomed to using are now blocked. For these programs, there is a shield icon next to their icons and nothing happens when I click on them. I notice that the screen blinks slightly, but I do not get prompted for a password and the program still does not run. It seems these programs may only be accessible through an Administrator account. However, right-clicking and selecting "Run As Administrator" does not work. After some research, I found a way to enable the hidden built-in Administrator account. I booted the computer into safe mode. In the command prompt, I typed net user administrator /active:yes. I gave the account a password. I rebooted the system. There is now an Administrator account on the home screen. However, the locked programs behave no differently for me when I use this account. What could cause this problem? How can I fix it?

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• What could cause an 101 Error in WAMP under Windows 7 ?

  - by Brayn

  Hey, I'be been using WAMP for local development for quite a while now but lately I've been getting an Error 101 message when I browse localhost sites. It's possible for this to have appeared after the last WAMP update but I'm not 100% sure on this. If I try again and again, after several page refreshes it works but it's really annoying! The exact error message is: Error 101 (net::ERR_CONNECTION_RESET): Unknown error. This is my configuration: OS: Windows 7 Apache: 2.2.11 PHP: 5.2.9-2 WAMP: 2.0 Also the local scripts connect to a remote MySQL server, they don't use the local MySQL(I don't know if it matters, just though I let you know). I've been looking into the apache logs and I've found the following. It seems that the apache server keeps restarting and I can't figure why: [Wed Oct 14 13:52:30 2009] [notice] Parent: child process exited with status 255 -- Restarting. [Wed Oct 14 13:52:30 2009] [notice] Apache/2.2.11 (Win32) PHP/5.2.9-2 configured -- resuming normal operations [Wed Oct 14 13:52:30 2009] [notice] Server built: Dec 10 2008 00:10:06 [Wed Oct 14 13:52:30 2009] [notice] Parent: Created child process 6784 [Wed Oct 14 13:52:31 2009] [notice] Child 6784: Child process is running [Wed Oct 14 13:52:31 2009] [notice] Child 6784: Acquired the start mutex. [Wed Oct 14 13:52:31 2009] [notice] Child 6784: Starting 64 worker threads. [Wed Oct 14 13:52:31 2009] [notice] Child 6784: Starting thread to listen on port 80. [Wed Oct 14 13:52:32 2009] [notice] Parent: child process exited with status 255 -- Restarting. [Wed Oct 14 13:52:33 2009] [notice] Apache/2.2.11 (Win32) PHP/5.2.9-2 configured -- resuming normal operations [Wed Oct 14 13:52:33 2009] [notice] Server built: Dec 10 2008 00:10:06 [Wed Oct 14 13:52:33 2009] [notice] Parent: Created child process 3572 [Wed Oct 14 13:52:33 2009] [notice] Child 3572: Child process is running [Wed Oct 14 13:52:33 2009] [notice] Child 3572: Acquired the start mutex. [Wed Oct 14 13:52:33 2009] [notice] Child 3572: Starting 64 worker threads. [Wed Oct 14 13:52:33 2009] [notice] Child 3572: Starting thread to listen on port 80. Also I've checked Windows Firewall and disabled any other protection that I have on this computer with no improvement. Thanks!

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