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

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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 ...
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1answer
4k 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 ...
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1answer
866 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 ...
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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 ...
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2answers
32k 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: ...
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2answers
2k 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: ...
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3answers
104 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. ...
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1answer
754 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 ...
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3answers
11k 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 ...
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1answer
438 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 ...
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2answers
724 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 ...
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6answers
1k 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 ...
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1answer
907 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 ...
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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 ...
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1answer
227 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 ...
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1answer
216 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 ...
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1answer
447 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 ...
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1answer
7k 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 ...
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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 ...
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1answer
318 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 ...
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1answer
504 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 ...
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1answer
403 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
2k 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 ...
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1answer
70 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 ...
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1answer
161 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 ...
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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 ...
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2answers
3k 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 ...
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2answers
876 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 ...
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2answers
761 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 ...
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2answers
315 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, ...
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1answer
162 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 ...
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1answer
861 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. ...
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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
4k 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 ...
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8answers
19k 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 ...
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3answers
531 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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13answers
63k 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 ...
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3answers
20k 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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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 ...
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1answer
276 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 ...
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5answers
565 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 ...
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2answers
1k 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 ...
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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 ...
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5answers
6k 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 ...
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1answer
545 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 ...
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1answer
460 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 ...
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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 ...
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2answers
5k 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 ...
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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 ...
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3answers
144 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 ...