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• hosts.deny not working

  - by Captain Planet

  Currently I am watching the live auth.log and someone is continuously trying the brute force attack for 10 hours. Its my local server so no need to worry but I want to test. I have installed denyhosts. There is already an entry for that IP address in hosts.deny. But still he is trying the attacks from same IP. System is not blocking that. Firstly I don't know how did that IP address get entered in that file. I didn't enter it, is there any other system script which can do that. hosts.deny is sshd: 120.195.108.22 sshd: 95.130.12.64 hosts.allow ALL:ALL sshd: ALL Is there any iptable setting that can override the host.deny file

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• How can I debug Cisco Firewall ASA "Dispatch Unit" very high CPU utilisation from ASDM?

  - by Andy

  I have recently had my first firewall installed so I am very new to this whole situation. I am finding that Dispatch unit is becoming overloaded and it would appear to be the reason I get serious bouts of lag on my server. The firewall has had little configuration apart from me blocking all the ports in "Access Rules" and allowing only the ones the server needs and from where it needs them. I guess what I am after is assistance with locating the issues causing "Dispatch Unit" to take up all the CPU Regards --Edit-- With ASDM statistics I found that packets inbound (peak of 70-100k/sec from <1k/sec normal), traffic inbound (peak of 40-50kbits/sec from <1kbits/sec normal) and CPU all peak at the same time so I am pretty sure it is an attack of some sort but as a beginner with ASA I am not sure how to resolve

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• Making internal website available publicly (Win 2008 Server)

  - by endigo

  I have an IIS 7 web site that is running on a Windows 2008 Server (64-bit) VMWare on a Windows 2008 Server (64-bit) Host on my local network. My router is a Firebox XEdge and it has port 80 directed to the IP of the server on VMWare. I can reach the web site from inside the network, but I cannot reach the site from outside the network. I have other web sites that are working through the Firebox, and I am confident that it is configured correctly. I suspect that Windows 2008 server is blocking routed or public addresses, but I have shut down the firewall on the Server that is running on VMWare and the AVG Anti-virus to no avail. How can I make my site available publicly.

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• Large file copy from NFS to local disk performance drop

  - by Bernhard

  I'm trying to copy a 200GB file from an NFS mount to a local disk. The local disk is an XFS filesystem on a LVM on top of a RAID 5 system (hardware RAID controler). I'm using rsync to monitor the transfer speed. At the beginning the IO speed is about 200MB/s, stable for the first 18GB. But then the performance drops by a factor of 10-20 and never recovers to the initial rate. Sometimes it reaches about 50-100MB/s but just for a few seconds and then the process seems to hang for a bit. At the same time all file-stat operations on the target filesystem are blocking for a long time (minutes). Also interrupting the copy process blocks for several minutes, a sub-sequent delete of the partly copied file takes also several minutes. Any ideas what could be causing this?

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• Is there a lightweight MTA for Ubuntu 9.10 Desktop?

  - by Joe Casadonte

  I'm writing a Perl script to run as a cron job, and I want to email results & errors to a local account on the laptop. I'd like something that can talk SMTP (do any MTAs not adhere to SMTP?). I use Thunderbird 3, so I'll also need a POP/IMAP server (unless T-Bird can read straight from an mbox file; I'll have to check into that). No need for spam controls as I'll lock it down real tight, only accepting mail originating from the laptop itself. Thanks!

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• Troubleshooting "connection reset" error on my linux server

  - by Chris

  I fervently hope someone here can help me with the problem I am experiencing. I am a programmer, and I have very little understanding of linux sysadmin terminology/concepts. I am attempting to troubleshoot a problem with my website. It is a Facebook app, and whenever I try to connect using Chrome, I get an error stating that the "connection was reset". I have been Googling for four days straight trying to find a solution to this problem, but no joy. A big part of the problem is that I do not understand the terminology being employed, and the output from many of the tools referenced is likewise indecipherable to me. I am running a VPS with CentOS 5, apache, PHP, and MySQL. I could spam this post with a ton of information from my iptables, apache, etc but if anyone needs information from my server, please let me know how to get it, and I will post it here. Thank you for any help you can offer!

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• qmail questions - whitelisting and relays

  - by Richard

  My new server runs qmail, which I've never used before. There is no inbound mail on the server (all the clients have mail hosted elsewhere, but some systems on the server send mail. I'm about to move a client there who has several parked domains, and looking at the smtp log, the server is already blocking many attempts to relay spam using one of the parked domain names (probably because a related domain is already hosted there). How do I ensure those mails stay blocked, while allowing legitimate addresses to send out? Server OS is CentOS and hosting software is Kloxo.

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• Security measures for CentOS

  - by cappuccinodrinker

  I have been tightening up my web server security and wanted to know what else I can do. I am running CentOS 5 with these measures: - All passwords to FTP, MySQL etc are generated from grc.com/passwords.htm and microsoft.com/protect/fraud/passwords/create.aspx (for the ones which cannot be too long). - Running iptables with all ports shut off except for http mail and smtp, the important ports like FTP SSH are blocked to all except my static office IP. There is also no response to pings. - Rootkit Hunter running daily - The server is PCI compliant according to Comodo - Not running any crappy made php apps, we use Zend Framework for our stuff and do have kayako installed and keep them up to date. Can't really think of anything else I can do... I could implement a brute force measure, but I think I already have by simply changing my SSH port to a number above 10000 and blocking it off with iptables.

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• Why doesn't tmux respond to shortcuts properly?

  - by Marc

  I'm using OSX 10.8.1 in combination with iTerm2, zsh and tmux via Homebrew. The beginning of my ~/.tmux.conf file looks like this: set -g prefix C-a unbind C-b bind-key a send-prefix set -sg escape-time 1 When I start tmux and press C-a c, nothing happens. When I spam C-a c fast enough then some new tabs open up, but not the equivalent count of my command spaming. When I press C-a first followed by c, nothing happens again. Is there a delay issue or what's up with my tmux installation/configuration?

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• Blocked connections passing through firewall. What is wrong?

  - by Kiranu

  In our company we have a small business router (Cisco RV082) on which we are using its standard configuration (block all incoming traffic). We also have an SMTP relay configured (using WS2008R2) so that our internal applications can send email through google apps (which requires authentication). The thing is that the server was being used to send spam. We fixed the problem by only allowing the server to relay email from our internal IP address range (10.0.0.0/16). My concern is that there was a way by which external IPs connected to the network and that underlying problem has not been fixed, but I cannot imagine how these machines connected. Any thoughts?

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• Concurrent modification during backup: rsync vs dump vs tar vs ?

  - by pehrs

  I have a Linux log server where multiple applications write data. Data is written in bursts, and in a lot of different files. I need to make a backup of this mess, preferably preserving as much coherence between the file versions as possible and avoiding getting truncated files. Total amount of data on the server is about 100Gb. What I really would want (but can't) is to shut-down, backup the system cold and then start it up again. What kind of guarantees against concurrent modification does the various backup tools give? When do they "freeze" the file versions? I am looking at rsync, dump and tar at the moment, but I am open for other (open source) alternatives. Changing the application or blocking writing for backups is sadly not an option. System is not running LVM (yet), but I have considered that for rebuilding the system and then snapshots.

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• Setting up Multiple Routers (as Hardware Firewalls) behind a Home Router

  - by Synetech

  I’ve currently got one computer behind a router with built-in firewall functionality, connected to a home cable-modem that has a single Ethernet port and one IP. I’m going to have to set up another computer for the rest of the family to use which of course will need to be connected to the Internet, probably wirelessly since the modem is in my room and the new system would not be. What I would like to do is to get two more small routers with firewall capability and connect each computer to a router, which would in turn connect to the main router which connects to the cable-modem. That way, both systems have a hardware firewall protecting them (particularly the wireless system) and the burden of blocking would be reduced on both the computer CPUs and the main router because the secondary routers would handle some of the workload. I’m trying to find out about the complexities inherent in this design and how I could set it up to work, specifically the IP handling and NAT aspect. Thanks a lot.

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• MailServer Setting

  - by Ashian

  Hi I have a mail server on windows 2003 ( MailEnable) I setup mail server to authonticate users before sending mail. (This mail server requires authentication when attempting to send to a non-local e-mail address) but from yesterday , without change any setting I got many Message Delivery Delay from mail server for email address that I never try to sending email: I afraid that I someone try to sending Spam from my mail server,How can I check this possiblity ? and fix the problem. Thanks MailEnable: Message delivery has been delayed. Message is waiting at *.info for delivery to mailin-03.mx.aol.com. The message will be retried for another 29 hours. Reason: Mail Server for aol.com could not accept your email at this time. MailEnable will keep trying to deliver this message and will notify you of any progress. The remote mail server returned the error: 421-: (DNS:NR)

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• Hp Procurve Switch : port filtered

  - by user117140

  My HP Procurve switch is blocking port 22 and I dont know how to unblock it.Please let me know From the server, see port 22 is blocked [root@server ~]#nmap -p22,80,443 10.247.172.70 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2012-04-16 14:12 IST mass_dns: warning: Unable to determine any DNS servers. Reverse DNS is disabled. Try using --system-dns or specify valid servers with --dns_servers Interesting ports on 10.247.172.70: PORT STATE SERVICE 22/tcp filtered ssh ------------------> see 80/tcp filtered http 443/tcp filtered https This is blocked on cisco switch but I dont have any clue how this is done. I know that vlan is configured on switch. vlan 54 ip ospf 10.247.172.65 area 0.0.0.10 vrrp vrid 54 owner virtual-ip-address 10.247.172.65 255.255.255.192 priority 255 enable exit exit Please let me know how to unblock ssh port 22 access on this switch?

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• Can't access LAN computers with SSH

  - by endolith

  I got a new Windows 7 machine, and was using VNC,SSH etc to connect to my Ubuntu machine, and it worked fine previously. Now it doesn't work if I use the machine's hostname or local IP, but if I use the DynDNS name, it works. I can also access it from my Android phone using the local hostname over SSH. If I try to connect with SSH to the hostname, it says "Host does not exist". VNC says "Failed to get server address". NX says "no address associated with name", and I don't see it in Windows' "Network" folder. I've rebooted everything. I've turned off Windows firewall. It was working fine a few days ago, but now it's not. How do I figure out what's blocking it?

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• User account automatically filling up with dead.letter file

  - by jeroen

  I have one user account on a server with about 400 accounts that is filling up automatically. The dead.letter file in the users home directory automatically grows until the account is full (about 10 - 40 Mb per day). The user is using Microsoft Outlook to send and receive mail. What can be causing this and how can I avoid it from happening? Right now I have an emergency cron-job to delete the file but I would like "real" solution. Edit: The server version is Red Hat Enterprise Linux ES release 4 (Nahant Update 4) Edit 2: It seems mainly spam and I see different mailer headings (from php to Outlook Express) and a frequent appearing header is [email protected] Update: I have asked the hosting provider where I use that dedicated server to look into the problem as well, as it's their Control Panel that could be a cause of the problem.

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• How would you measure the amount of atmospheric dust in a server room?

  - by Tom O'Connor

  We've been advised by our tape library vendor that one of the reasons we might be seeing lots of errors is if our server room is particularly dusty. It doesn't look dusty, but that's not to say it's not there. We've got an environment sensor cluster which measures Temperature, Airflow and Relative Humidity. I should probably point out that the low-hanging fruit solution I came up with is to use Sellotape (scotch tape) in a loop, one side stuck to the server cabinet, the other side free-hanging. I've also put a couple of other tape loops by the exit and intake fans of the hardware (not blocking airflow, naturally). How can we (electronically, ideally) measure dust levels?

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• Sending emails with remote mail server in ASP.NET blocked by Windows firewall?

  - by Dave

  I want to migrate a web application from a Windows Server 2003 to a Windows Server 2008 R2. All works fine except sending emails from the application. If I configure the application to use the smtp server on "localhost" it works, but changing it to the "real" host name (e.g. mail.example.org) no mail is sent. The error message says, that the remote server needs a secure connection or smtp authentication. But since it works when using "localhost" instead of the host name I doubt that this is the problem. Also it's unlikely a problem with the mail server, I also tried it with another one. So for me it seems like the firewall is blocking the outgoing connection to the mail server. I tried to open port 25, but it still did not work. Maybe I just did it the wrong way.

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• Finding a private (NAT) host's IP using historic destination data

  - by l0c0b0x

  The issue: An unknown private (NAT) client is infected with malware and it's trying to access a Bot server at random times/dates. How we know about this: We receive bot traffic notices/alerts from REN-ISAC. Unfortunately, we don't receive those until the next day after it has happened. What they provide to us is: The source address (of the firewall) The destination addresses (it varies, but they're going to network subnet allocated to a German ISP) The source port (which varies--dynamic ports). Question: What would be the best approach to finding this internal host (historically) with a Cisco ASA as firewall? I'm guessing blocking anything to the destination address(es), and logging that type of traffic/access might allow me to find the source host, but I'm not sure which tool/command would be the most useful. I've seen Netflow thrown into a few responses when it comes to logging, but I'm confused with it's association of Logging, NAL, and nBAR, and how they relate to Netflow.

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• There is a porn domain pointing to my site

  - by Nicolas Martel

  Let's say example.com is my real site, and fooexample.com is the porn site. fooexample.com are pointing to my ip. Now you could think, just don't mind it right. Well the thing is that they are driving load of traffic. Not only that, but my main domain example.com become unavailable after a couple of minutes and the only domain that work is either fooexample.com or none of those 2. What i have done so far was using mod_rewrite to redirect the porn site to google but my domain still become unavailable. Blocking the ips served no result either. I hope someone will be able to help me because this is a huge problem right now. Thanks.

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• ssmtp for windows

  - by reox

  I have the following problem with a software that should do mail notification for a biometric entry system: the software does currently only support SMTP over port 25 without TLS/SSL. Which is bad because port 25 is blocked in our network due spam reason and our mailserver only support TLS / SSL logins. so i need a solution to connect to a localhost smtp server which just relays to my ssl host on port 587. i know there is ssmtp for linux, but i need it for windows, because the server app for this biometric stuff only runs on windows... edit: i know there is the IIS SMTP Server, but maybe something different?

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• Remote Software Solution that Acts as a Client

  - by Richard

  I am looking for something that I am not sure exists. I have a remote computer that will not allow incoming traffic due to ISP blocking of ports(basically double NAT situation that I am unable to get around). I am wondering if I have a computer acting as a client, is there any solution out there that will allow remote access to the computer. I do have other servers on the net that have static IP's that the computer could initiate a connection with. I am thinking of using Debian Linux, However computer is not built yet so OS is not overly important at this point.

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• Using unsigned drivers in Windows 8

  - by T. Fabre

  I just migrated from Windows 7 x64 to 8, but I can't get my VPN software to run anymore : the SafeNet IKE service (installed by SafeNet SoftRemoteLT GA, used by my VPN provider) cannot start anymore. I found that by default unsigned drivers are disabled on Win8, and that is what is blocking the driver. The System event log tells me that the driver (apparently, C:\WINDOWS\SysWow64\Drivers\IPSECDRV.sys ) was blocked when I try to manually start the service (SafeNet IKE Service). I get the same messages for another driver, crypto.sys found in the same folder. I tried using bcdedit to enable unsigned drivers : bcdedit /set loadoptions DDISABLE_INTEGRITY_CHECKS bcdedit /set testsigning ON After reboot, same error. I tried by booting into Win 8's test mode, same issue. Applying the code signing policy (Enabled, Ignore) does not help either. Running gpresult does show that the policy is applied. Any help welcome.

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• Which is prefered internet security + Antivirus solution for Windows, with good detection rate? [clo

  - by metal gear solid

  Possible Duplicate: Free antivirus solutions for Windows Which is the best internet security + Antivirus solution for Windows? free/opensource or commercial it doesn't matter I need best solution. Is Kaspersky best ? or any other? http://www.kaspersky.com/kaspersky_internet_security Award-winning technologies in Kaspersky Internet Security 2010 protect you from cybercrime and a wide range of IT threats: * Viruses, Trojans, worms and other malware, spyware and adware * Rootkits, bootkits and other complex threats * Identity theft by keyloggers, screen capture malware or phishing scams * Botnets and various illegal methods of taking control of your PC or Netbook * Zero-day attacks, new fast emerging and unknown threats * Drive-by download infections, network attacks and intrusions * Unwanted, offensive web content and spam

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• Why do some web servers not respond to icmp requests?

  - by John Himmelman

  What is the purpose of blocking/dropping inbound ICMP traffic on a public web server? Is it common for it be blocked? I had to test if a server was accessible from various locations (tested on various servers located in different states/countries). I'd rely on ping as a quick & reliable method of determining if a server was online/network-accessible. After not receiving a response on a couple boxes, I tried using lynx to load the site, and it worked.

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