Troubleshooting is a form of problem solving, often applied to repair failed products or processes.

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2
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6answers
965 views

My Ubuntu 10.04 server kills all WAN bandwidth when it's attached to my LAN. Where do you begin troubleshooting?

First I should say that my Linux knowledge is minimal; just enough to set up some servers (Apache, Tomcat, Couch, etc). I built a MiniITX server to host some simple sites, act as an SSH tunnel while ...
0
votes
1answer
701 views

Troubleshooting why my SSH sessions hang for a couple of seconds

I'm logged in to my development box via SSH (using PuTTY on my laptop) and periodically, the session would just hang for a couple of seconds then becomes responsive again. I have not been able to ...
1
vote
2answers
2k views

What steps should I take to determine the root cause of linux server failure?

I am sorry if this question has been addressed before, I am assuming it has, but after a half hour of searching I couldn't find anything. Anyway, to the question: I am a windows guy and a ...
2
votes
1answer
223 views

VPN troubleshooting

I have a user that is having trouble VPN to the office. What are you top troubleshooting things to try to find out where the problem is. The error the user is getting is Error 806 - a connection ...
0
votes
1answer
204 views

Apache Permission issue

How do I resolve an issue of permissions in apache. The initial task that I am trying to get working is to upload a mura plugin the the temp directory of ColdFusion9. However, I have since discovered ...
2
votes
1answer
369 views

blat.exe getting deleted from my servers

we're using blat.exe as part of many of our setups on Windows Server 2003 SP2 without any problem to send mails via command line. It's simply great. Now, some software we are using provides blat.exe ...
0
votes
1answer
5k views

RSA Authentication Manager - Unable to resolve principal by login ID and/or alias

I'm attempting to setup a RSA authentication manager with a Microsoft Active Directory as the identity source. When I try to login from the Windows login client the login attempt failed and I recieve ...
0
votes
2answers
3k views

How can I diagnose an Ubuntu system freeze after reboot

One of our servers froze yesterday, apparently refusing to serve any HTTP requests. The tech guy on site could not connect remotely to the machine, so he rebooted the (virtual) machine from the VMware ...
0
votes
1answer
294 views

Unexplained Opsview configuration error

Somehow I've broken by Opsview configuration, and it gives me a completely unhelpful error: critical 2010-10-12 12:09:57 Cannot reload:. It looks like there should be more info, but there's not. I ...
1
vote
1answer
464 views

Troubleshooting Windows XP “RestrictRun” policies

I'm at a site where user accounts are limited to running only certain programs (according to file name), through the Windows XP RestrictRun policy mechanism. I realize this is largely useless as a ...
0
votes
1answer
362 views

Track email sent to a specific address in Exchange 07

I have SBS 08 with Exchange 07. Domain users have several email addresses pointing to their mail box. For example John Smith: jsmith@..., john.smith@..., smith.john@... I want to track emails sent to ...
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2answers
1k views

Why does samba server fail to start with PANIC error?

I'm seeing an error when trying to start smbd: # smbd -i smbd version 3.2.5 started. Copyright Andrew Tridgell and the Samba Team 1992-2008 ...
0
votes
1answer
68 views

IT counterpart to medicine's ICD-10/DSM-IV for diagnosing problems?

I've often thought about why there aren't any diagnostics manual on a very broad level, a counterpart to the medical DSM-IV/ICD-10 manuals. From a troubleshooting perspective, the work of an ...
0
votes
1answer
157 views

centos server - basic troubleshooting steps

I have a VPS server running CentOS - it's been great for about a year but has just got a little flaky, going down every couple of days and requiring a reboot. I was hoping you could offer me any ...
0
votes
1answer
39 views

Failure to install ServletExec 4.2

We are attempting to install ServletExec and get this puzzling error during the installation: we can install to XPSP2 with out getting the error. we get the error when attempting to install on ...
-1
votes
2answers
2k views

Postfix not actually sending e-mails

So after following the Ubuntu Postfix tutorial, I tried their recommended test telnet localhost 25 MAIL FROM: person@mydomain.com RCTP TO: person@gmail.com DATA some text here . I received a ...
0
votes
2answers
829 views

Openvpn and bad routing = multiple external IP Adresses

I have an OpenVPN server on ubuntu and the client (Openvpn 2.1_rc19) on windows7 x64. The connection is established an I can use it. However not all traffic is routed through the openvpn interface and ...
1
vote
2answers
640 views

Server is too busy

We have an advertisement sever which handles loads of requests at a time, however sometimes out of the blues it shows 'Server is too busy' and an 'iisreset' has to be executed in order for the server ...
5
votes
2answers
304 views

List of Sysadmin Troubleshooting “Fire Drills”

One of the hardest things to do is to train sysadmins to solve problems (think) in a consistent way, especially when under pressure, the emergency bells are ringing, etc. For some training sessions, ...
0
votes
1answer
156 views

Ubuntu guest (virtual box) doesn't show on the router

I installed Ubuntu (as a virtual machine using virtual box) with the openssh server option and apache. When I do ps -ef | grep apache I see apache is running. But: I can't connect to the server ...
1
vote
1answer
762 views

Uneven load with Microsoft Network Load Balancing (Server 2003)

I am a network administrator at a small company that uses Network Load Balancing (NLB) to cluster our terminal servers together. Recently, we changed our network setup due to PCI-DSS compliance. ...
0
votes
2answers
1k views

VMware workstation 6.5 VMs (Host-only network with static ip address) cannot ping each other

I had specified Host-only network and disabled the dhcp server that comes with the Host-only network. I had setup the following network config, vm1 ip address: 192.168.147.2 netmask: 255.255.255.0 ...
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2answers
3k views

How can I capture traffic with tcpdump and a sliding window or sort of “logrotate”?

I want to capture some traffic with tcpdump for troubleshooting. The problem is, the error is not reproducible. To not fill up the hole disks with captures, I would like to capture the traffic with ...
12
votes
8answers
13k views

Troubleshooting a “slow” network

We've all had a complaint that the "network" is "slow" at some point: might be localized to one room (switch) or one computer, might just be Internet (DNS? Browser issue?), might be just one ...
2
votes
3answers
454 views

Server goes offline. What to look for?

I'm using a new virtual server through GoDaddy, and this morning I received a call from the powers that be informing me our website was offline. After confirming this, I requested a power cycle ...
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votes
11answers
44k views

Unable to logoff, disconnect, or reset terminal server user in production environment

I'm looking for some ideas on how to disconnect, logoff, or reset a user's session in a 2008 Terminal Server (unable to login as the user either as it is completely locked-up). This is a production ...
3
votes
3answers
15k views

Best way to troubleshoot apache not starting?

We have recently gotten a backup server to mirror all our data onto in case the primary server goes down. I've gotten all the sites data updated through rsync, and all the apache config and databases ...
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votes
2answers
1k views

Hyper-V Guests suddenly stopped working

Here's my configuration: Windows Server 2008 R2 Standard as a host OS, and two guests VMs running the same exact OS. Yesterday, Trial Activation on all OSes has expired and quite naturally all ...
0
votes
1answer
270 views

Need troubleshooting advice for intermittent dns problems with requests on isp nameservers

I've been having some intermittent dns problems with a web server, where certain isp's dns servers don't have my hostnames in cache and fail to look them up. At the same time, queries to opendns for ...
2
votes
5answers
556 views

NetBios Name Service requests

I'm noticing on MS Network Monitor a ton of NetBios Name Service broadcasts coming from a particular workstation. When I run netmon on that desktop it cannot resolve the application producing them ...
1
vote
2answers
942 views

raid 1 and high load average

i have a server with high load average, I think the problem is the raid 1. Server is in one or two points of load average, and in seconds jumps to 10 points (md4_raid1 process), this happens once or ...
2
votes
2answers
2k views

Diagnosing Hardware Problem in Linux Server that's Kernel Panicking

We have a server that has been occasionally kernel panicking for a while now that we believe has a hardware problem. How would you go about troubleshooting hardware that you don't have physical access ...
2
votes
5answers
5k views

Ubuntu 9.10: how do I troubleshoot a startup script that doesn't appear to run?

I've created a bash script 'foo'. I've made that script executable with chmod+x and added it the the start-up by running sudo update-rc.d foo defaults 80 Despite that, it doesn't appear to be ...
3
votes
1answer
528 views

Word 2003 Normal.dot template always becoming corrupt

I have a user who always seems to have an issue with his normal.dot file becoming corrupt. In the past I've deleted or renamed the normal.dot file, and reopened to create a new one. This seem to fix ...
0
votes
1answer
423 views

How to detect Router or Transmission line error

I have a large LAN at my company. I suspect that there is a failure of a router or of a transmission line connecting routers. I want to narrow down the search, where is the fault. How could I narrow ...
3
votes
2answers
1k views

Alternate Out of Order TCP Packets problem

I have a Windows network with embedded nodes connected to a series of Cisco switches. I have been seeing some serious network problems starting a few days ago. I used Wireshark to capture the network ...
1
vote
2answers
4k views

Windows Server 2003 DCDiag error message “delegation is broken for foo.com.foo.com on dns server”

It started as a simple diagnostic: dcdiag /c when it ran it gave me the following error from the DNS portion of the DCDIAG test delegation is broken for foo.com.foo.com on dns server on dns ...
2
votes
4answers
1k views

Random server lag, no CPU/mem/pagefile usage

We have a fairly new server running Windows 2003 SP2, and the past few days we've noticed random slowdowns. When I'm logged into the server over remote desktop while this is happening, or if I'm ...
0
votes
3answers
143 views

How can I rename a file in novell sever?

My Server is using netware 4.X, I am one of their client. I can map the drive in F:\ for example, and I want to rename the file which is located in F:\ , but I get follow error: Duplicate file ...
0
votes
3answers
79 views

The network routes A.com and sub.A.com so differently

Route is based on IP, right? How does it possible to route my packets so differently? One is success, but another is not. # traceroute A.com traceroute to A.com (1.2.3.4), 30 hops max, 60 byte ...
2
votes
3answers
2k views

Computer only starts on Last known good configuration

My computer restarts everytime the login dialog is about to appear. It only loads fine on 'Last known good configuration' option What steps should I follow to debug this issue? OS: Windows Server ...
1
vote
2answers
90 views

http server connectivity puzzle

I have been seeing some strange connection issue in the production environment. The setup has two IBM Http Server's (IHS) and a network IP load-balancer in front of them (round-robin). One instance ...
0
votes
2answers
344 views

Better approach for diagnose web server failure

Yesterday my web sites were down for a short time. I logged on my server and my first reaction was restart the apache web server. After that everything was working fine. So I start to check the ...
0
votes
7answers
738 views

Good tools and approaches for diagnosing poor performance

My company is developing a web-based data viewer application which requires a fairly decent amount of bandwidth to function well. However recently we have been changing a lot of things. For example, ...
5
votes
8answers
5k views

creating decision tree based troubleshooting documentation?

We troubleshoot a lot of server and network issues and follow a loose set of steps on what to do in different cases. With more and more people and responsibility, the need for standardization is ...
1
vote
1answer
460 views

ISA Server: How to troubleshoot DHCP problem?

I've added a DHCP Server to my ISA Server. The purpose of the DHCP server is to provide addresses to a DMZ (on its own interface) for misc computers that need internet access but don't need to be part ...
11
votes
6answers
20k views

Why was my ping answered by a different IP address than the one pinged?

While trying to setup a MSSQL clustering solution, I am running into a problem that is outside of my expertise that is related to networking. I was trying to find a free IP to used for my node. I ...
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vote
3answers
5k views

Trouble setting up a DD-WRT router with a DSL gateway

Our office is fairly small. We previously had a 2wire gateway that came when we ordered our DSL connection. I recently decided to upgrade to a router that could support DD-WRT since the 2wire was very ...
0
votes
2answers
3k views

remote connections and mysql on ubuntu?

I have Ubuntu running in VMWare. I installed mysql 5 server and comment out bind-address and restarted the mysql server. I am now trying to connect to mysql but i cannot. I tried using 1) Code and 2) ...
2
votes
4answers
247 views

Diagnose Network Faults

Disclaimer: I am a developer, not a system admin, please be gentle. Where I work we are having a lot of intermittent network problems. Sometimes the DNS will fail, but access to servers can be done ...