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

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2answers
537 views

syslog or splunk forwarding over the internet

I have a web application that is split over a couple of sites in the US and the UK. When we have issues I would like to be able to view the collated error logs from the 2 sites. So I was thinking ...
1
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2answers
562 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
287 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
145 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
625 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
2k 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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7answers
10k 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
390 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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9answers
28k 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 ...
2
votes
3answers
12k 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
884 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
261 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
543 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
824 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
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2answers
1k 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
4k 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
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1answer
505 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
370 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
3k 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
974 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
137 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 ...
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3answers
76 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 ...
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3answers
4k views

Troubleshooting a network interruption

My company is pretty much entirely a Windows shop: Microsoft firewall, all Windows servers, etc etc. The hardware is mostly Cisco or Cisco-like. For about three weeks, we've experienced "random" ...
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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 ...
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2answers
88 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 ...
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2answers
332 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 ...
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7answers
718 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, ...
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8answers
4k 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 ...
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1answer
451 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 ...
10
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6answers
16k 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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3answers
4k 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 ...
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2answers
2k 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
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4answers
238 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 ...
2
votes
2answers
831 views

Troubleshooting Amazon EC2 reboot

We've had a server (CentOS) running in EC2 for a few months. It had been going pretty smoothly until today when we got an alarm that the server was unavailable (HTTP service couldn't be reached). So I ...
2
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3answers
614 views

Server Performance Issue - Server 2008, SQL 2008 and Hyper-V [screenshots]

Im getting nasty performance on my server. It happens radmonly while accessing a website, but more often, right on the first time I load it. The server/webapp are still in dev, so I'm the only one ...
0
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1answer
217 views

How can I troubleshoot error 10049?

We have an multi-tier application that lets our clients connect through the internet to us and have run into an interesting problem recently. From some client locations, User A will attempt to ...
2
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4answers
483 views

Tracking down load average

The "load average" on a *nix machine is the "average length of the run queue", or in other words, the average number of processes that are doing something (or waiting to do something). While the ...
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4answers
1k views

>40Hz DNS query xxx.1.168.192.in-addr.arpa, unknown cause

On one of my FC10 boxes I noticed that the network activity lights keep flashing even when I'm doing nothing on it so I pulled out wireshark and took a look at whats causing it. It's logging the same ...
2
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3answers
2k views

How to determine SQL causing Oracle CPU Spikes

I have a J2EE Spring/Hibernate webapp using Oracle 11g for persistence, occasionally in production the Oracle CPU spikes to 100% usage, restarting Tomcat drops the Oracle CPU. I am unable to ...
2
votes
2answers
7k views

Can someone see why my DNS won't work? I followed everything in the tutorial, but won't work

If anyone can help me troubleshoot this, I would very much appreciate it!! The tests work. It's just that when I do the manual ping/nslookup test, nothing is working. By the way, I followed ...
0
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2answers
538 views

gltail “Missing gem net-ssh”

I'm attempting to get gltail set up on my local system to monitor logs remotely. I've got all the dependencies installed, but when I go to run gltail ... ./gl_tail configfile ../config.yaml I get ...
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10answers
2k views

Etiquette of Troubleshooting Problems In The Workspaces Of Others

A visibly upset colleague approached our technical support team this morning. She noted a member of our team had changed her workspace: Her monitor was turned off (she expected standby mode). Her ...
3
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7answers
619 views

Wireless network signal strength troubleshooting… where to start?

Here is the information displayed by the wireless router (see end of post). The problem is that my netbook does not get any signals from the router if moved more than 3 feet (yup, three feet) away ...
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2answers
3k views

VMWare workstation 6.5 bridged networking stopped working

I have an XP client running on a Vista host. The client used to have bridged networking working fine, lately it stopped working for no aperant reason. Other kinds of networking works, though. It ...
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3answers
2k views

On Windows Server 2008, how to troubleshoot IIS hang when CPU, Disk IO are normal?

Can someone recommend a good strategy for troubleshooting IIS that is hanging on Windows 2008? Normally, I check the following in Process Explorer: CPU Disk I/O Context Switch Delta However, in ...
52
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8answers
28k views

Environment variables of a running process on Unix?

This is to troubleshoot some problems related to environment variables .. On Windows, I could do this by using tool such as ProcessExplorer to select particular process and view values of each ...
2
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4answers
2k views

How Do I Debug An IMAP Problem?

I am setting up an email server with Postfix and Dovecot. Remote email clients can read email, but cannot reply to it or send new messages. (Email clients local to the server receive and send email ...
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4answers
3k views

How to diagnose a hang when creating a new folder in explorer.exe

I have been having some issues with explorer.exe hanging when I create a new folder. If I use Analyse Wait Chain in the Resource Monitor it says "One or more threads of explorer.exe are waiting to ...