Tagged Questions

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

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0
votes
1answer
619 views

Troubleshooting Nagios alerts; aka. Why aren't my alerts firing?

I'm attempting to add email alerts to an existing Nagios install. I've been using the web interface to keep an eye on some non-critical systems for a few months and it's been running well; warnings ...
1
vote
3answers
117 views

Ubuntu 10.04 install is missing /etc/rc0.d, is there a quickfix?

I have no idea how this happened, but /etc/rc.*/ is simply missing. As a result, aptitude and apt-get don't work right anymore. Is there a quick-fix for this? I really don't want to reinstall the OS ...
8
votes
3answers
1k views

Performing root-cause analysis

I want to learn more about how to perform root-cause analysis. More times than not, our department tells the user to try rebooting (thier Windows XP system), which actually "fixes" a good number of ...
0
votes
1answer
99 views

Proxy-Connection Header associated with failed connections

I work with microprocessor devices that have/run a micro webserver. I have two of these devices set up so that they can be accessible to/by the Internet - I'll call the devices "A" and "B". ...
1
vote
1answer
162 views

End-user SSL certificate management workflow

We have an internal website, served from behind HTTPS with client certificates. Website users are non-technical persons, working remotely. They use Windows (XP, Vista, 7) and OS X (10.5, 10.6, 10.7). ...
0
votes
4answers
327 views

Ubuntu troubleshooting

I have a computer which keeps becoming unreachable, and a restart fixes the problem. It's under somewhat heavy load (high cpu, and high ram usage), but appears for the most part stable. What's a good ...
1
vote
2answers
899 views

Server is rebooting unexpectedly, strange kernel messages in log file

I have a server running Ubuntu 10.04 that is rebooting several times a day it seems, and I can't figure out why. It doesn't appear to be a graceful reboot either, because some of the services complain ...
2
votes
2answers
2k views

SSH closes connection when key is accepted

In server's auth.log: Failed publickey for agladysh from MYIP port 61313 ssh2 In ssh -vvv: debug1: Offering public key: /Users/agladysh/.ssh/id_rsa debug3: send_pubkey_test debug2: we sent a ...
0
votes
1answer
71 views

LAN - troubleshooting

I have 2 clients on my LAN that I'm trying to get to "see" each other. The first as follows Computer1 IP 172.21.62.230 Subnet 255.255.255.224 Default gateway 172.21.62.225 Preferred DNS server ...
0
votes
2answers
441 views

Troubleshooting firewall and routing on Linux

Are there any tools or API hooks for troubleshooting iptables or routing on Linux? (besides the obvious -j LOG) In other words: what to do when tables with 200 or 300 firewalling rules after adding a ...
0
votes
1answer
145 views

VMWare Workstation connection problems

Our old setup (which worked): On workstation W-1 (WinXP - 64bit) we had two virtual machines (VMWare 6.5) V-1 and V-2 (both with WinXP-32). All of them had a different IP static address, V-1 and ...
5
votes
3answers
4k views

Troubleshooting linux server reboots?

I have a Linux server I've just set up, debian squeeze, 2.6.32-5-amd64, and over the past week it's rebooted three times, twice in one day. There was no power outage that I am aware of (and it's ...
2
votes
2answers
239 views

my ssh sessions are randomly killed on Debian

I have a Debian 6.0.1 vanilla install, and I use PUTTY to ssh into it. I will usually have 3 or 4 PUTTY login shells running at the same time. What I'll find is that if I leave my computer for a ...
0
votes
1answer
519 views

High ping everywhere except one PC

I have a network with a really high ping (usually more than 500ms) except for one laptop. And in that laptop the ping is usually 5ms. I've tried: - using same model laptop - compare lan driver ...
1
vote
1answer
47 views

Troubleshoot DBMail in SQL Server 2005

On a SQL Server 2005 machine, I have DBMail setup and correctly configured. I am able to use "Notify Operator" and EXEC msdb.dbo.sp_send_dbmail to queue emails. But the problem is the queued mails ...
1
vote
2answers
109 views

troubleshooting a printer problem

I have a large Kyocera Printer/Scanner/Copier machine in a office with three PCs (all plugged into a lan via router. The three PCs all have individual printers (inkJets) hooked directly via printer ...
1
vote
0answers
3k views

ADFS 2.0 Errors Event ID 184 & 364

I have ADFS servers set up and each component such as in URN, relay, claims etc. in place, but am getting this error massage "There was a problem accessing the site. Try to browse to the site ...
1
vote
1answer
804 views

Maximum amount of memory per session with IIS/.NET

I'm troubleshooting some memory issues we're running into with a heavily used ASP.NET site hosted on IIS6. Intermittently we have to manually recycle our application pool (process) to resolve issues ...
4
votes
2answers
2k views

Cannot mount /dev/sdc1 on Debian 5.0, special device /dev/sdc1 doesn't exist

I'm trying to fix an odd problem I'm having that I've never seen or heard of before. I have a disk, /dev/sdc and I'm trying to mount it, but cannot. sudo mount /dev/sdc1 /mnt mount: you must ...
0
votes
1answer
672 views

Port forwarding not working, tcpdump shows “reset connection”

I have an home web server that I use to serve a few pages for personal purposes. The server runs Ubuntu and is behind an ADSL connection, and it's working nicely. Recently I subscribed to a Hiperlan ...
0
votes
1answer
537 views

How can you identify why a Windows service (TeamCity build agent) is hanging when running a command?

I've got a problem with a Windows service I just simply can't get to the bottom of. What I'm trying to do is execute the HP WebInspect 9.0 application from a TeamCity build agent which runs as a ...
1
vote
1answer
237 views

mac OS X version 10.6.5 network connection troubleshooting/solution?

Im connected to a small office network where where everything works fine. however once in a while or on a random occasion usually after the computer has been left on or on sleep all night there are ...
1
vote
1answer
227 views

DHeapmon not reporting expected number of total desktops in IIS6

Hope someone can help me make sense of this. I'm trying to debug some COM+ errors we see in our production environment and a few of them report that the desktop heap is exhausted, so I installed ...
-1
votes
1answer
89 views

DNS oddities with different nameservers

My ISP's DNS servers are sometimes sketchy, so I use 4.2.2.1 and 8.8.8.8 respectively. The Layer 3 DNS server and Google's DNS server. Sometimes there will be a long delay in resolving, and if I ...
1
vote
1answer
571 views

COM+/Desktop Heap errors in IIS affecting sites at random?

We have a Win2K3 server that is hosting 30+ sites. Each site is configured to have its own unique application pool -- so that we can manually recycle specific sites if needed and not kill sessions ...
1
vote
1answer
352 views

How do I troubleshoot network connectivity problems in windows?

I'd really like to understand how to debug my network connectivity issues, but everything I find on the internet is either for basic users on "How to add a wireless network" or it's people talking ...
1
vote
1answer
3k views

What causes the issue (possibly packet loss) in this scenario

I'm trying to diagnose a network related problem - please understand these points before suggesting an answer (apologies if more information is required, I will add anything people ask). We have a ...
0
votes
1answer
591 views

Random Ubuntu server network disconnects

After installing Ubuntu Server 10.04.1 on a new x86_64 kvm instance (Debian 6.0 hosted) I'm getting -apparently- ramdon disconnects from the server. Read from remote host myserver: Connection ...
3
votes
5answers
2k views

Open ports broken from internal network [duplicate]

Quick summary: Forwarded port works from the outside world, but from the internal network using the external IP the connection is refused. This is a simplified situation to make the explanation ...
14
votes
2answers
21k views

page allocation failure - am I running out of memory?

Lately I've noticing entries like this one in the kern.log of one of my servers: Feb 16 00:24:05 aramis kernel: swapper: page allocation failure. order:0, mode:0x20 This is what I'd like to know: ...
0
votes
2answers
1k views

Troubleshooting PXE Boot in CentOS

I am working on troubleshooting a PXE server that we have setup for use. It is based upon Cent OS 5.5. We installed the following components on top of a relatively vanilla install of Cent OS: ...
2
votes
3answers
94 views

Resources on Java for Sys Admins? [closed]

I've been fortunate enough to make it four years as an SA without having to administer systems making use of Java. My luck has run up and I am starting a new job and they make extensive use of Java. ...
3
votes
1answer
595 views

How to analyze which virtual host account is most greedy?

Hi there and sorry if this is too noobish. I've tried to find the answer myself as I usually do but I failed. What is the best practice when I need to analyze which virtual hosts are consuming the ...
2
votes
3answers
7k views

Fixing BIND9 rndc error “connection to remote host closed”

I just made some changes to a DNS zone in Webmin and clicked the "Apply Changes" button. I received the error message: rndc: connection to remote host closed This may indicate that the remote ...
0
votes
4answers
135 views

Troubleshooting Guides for End-Users

I am an IT Administrator. I would like to create and distribute simple troubleshooting guides for my end-users. Does anyone know if these can be purchased anywhere? Has anyone tried a similar project ...
0
votes
1answer
398 views

VMware server 2.0 SYN/ACK repeating issues

VMWare Server 2.0.0 Build 122956 I am having some issues with connecting into a guest VM (Ubuntu linux 4.4.3-4 lucid) running under VMware 2.0 on a windows server host. All connections to and from ...
1
vote
2answers
652 views

Need help trying to diagnose Symmetrix SAN performance issues

I am helping to benchmark hardware for a new SQL Server instance, and the volume presented to the OS for the data files is carved from a set of spindles on a Symmetrix SAN. The server has yet to have ...
2
votes
6answers
911 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
627 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
1k 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
218 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
196 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
329 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
4k 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
2k 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
273 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
440 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
323 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 ...
1
vote
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 ...