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Questions tagged [troubleshooting]

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

It is a logical, systematic search for the source of a problem so that it can be solved, and so the product or process can be made operational again. Troubleshooting is needed to develop and maintain complex systems where the symptoms of a problem can have many possible causes.

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Redhat Satellite 5.5.0 Remote Command Setup issue

I have setup Remote Commands on Redhat Satellite version 5.5.0 and trying to understand how the schedule works. The Remote Commands are already working on the clients but it appears that when we try to schedule it then it just hangs and only…
user67186
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How to troubleshoot internet unreachable periodically through firewall

Periodically the internet is unreachable on my network, sometimes for 30+ minutes. After testing a direct connection to our modem, I realized this was not a problem with our ISP but the network itself. What I've tried: I can ping the…
Gabriel Syme
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ESXi host halts, console seems responsive but

... as soon as I enter a user name and password, it freezes. Won't let me hit "enter" to log in. Management ports are not responding, guest OS's are not responding. It did this once last week after 1yr+ of being online, but it happened twice today…
Jeremy Holovacs
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Best way to trace outgoing requests from a server

We have an Ubuntu 14.04.1 LTS server with nginx 1.4.6 that hosts a few dozen websites and received an abuse complaint from another server of hundreds of requests like this: "POST /wp-login.php HTTP/1.0" coming from our server. How can I go about…
Craig
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MySQL server hangs without reason

I have a server running web site with back-end database MySQL (more specific - 5.5.37-MariaDB, for debian-linux-gnu on x86_64). Sometimes it stops accepting connections and web site scripts report "unable to connect to the server". After I restart…
Ralfeus
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Troubleshooting blocked/dropped ports on Sonicwall firewalls

Short of enabling packet capture/monitor on specific rules/policies, is there an easier way to see or to setup a Sonicwall to show blocked ports/services (realtime or as a report)? I think packet capture is an overkill. I do not want to see…
Alex
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How do I Interpret a Failed Request Trace?

I have a problem with a web site running IIS 7. The problem are the initial requests to each page: they take far longer than they should. After that first request the page loads fine. I'm sure the subsequent requests only work because of caching.…
Joel Coel
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Determine cause of connection refused on surveillance video unit

We have 3 similar surveillance video units. Each has a server that should be available on ports 80 and 443. One unit has suddenly become unavailable on port 80, and I'm working to determine what could be the cause. It was operating properly at 8:00…
Paul S.
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Advice on web server performance troubleshooting is needed

I'm renting a virtual CentOS based server where I have about 5 active sites running. Several months ago I noticed a significant performance degradation in how my sites are running. First symptom was too many (~300) apache processes running after…
Alexey
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Is it realistic to remotely troubleshoot network issues?

I have a small non-profit that I help that has a hub and spoke fiber network on managed Netgear switches. They have both T1 & DSL connectivity, separated by VLAN's with a simple VoIP system running. There are weird things happening and…
Stuart
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Cisco ASA: Terrible network speed once or twice a day, fine otherwise

I've been trying to get to the bottom of this for a while now and, well, it seems like I can't. We have two servers behind an ASA5505 (software version 8.3) at a datacenter. They run a wide variety of services, including our website, internal XMPP…
kshade
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How can i find out why my web server is refusing traffic from my web proxy?

I have a bit of an odd problem that I can't seem to figure out. I will preface this question with the fact that this exact setup was working just fine, and for some reason has stopped working properly. I have a web proxy to ensure users at one of my…
DKNUCKLES
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How to troubleshoot a hanging process in Windows?

I've been having the same problem with several applications lately -- I start them and they just hang. I don't see anything on the screen, however the application is listed in Task Manager and its CPU usage is 0%. Are there any utilities that can…
Ariod
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How do I identify unknown protocols on my Cisco 2811?

I have a misbehaving Cisco 2811. It serves our office of 20 with internet and phones via Call Manager Express. Except that lately the phones aren't working right and internet is choppy. The outside interface attached to our ISP is fine. The…
atroon
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Windows "net use" command throwing error, "System error 1909 has occurred"

What is the likely cause of this, if the command is run on Windows Server 2008? It appears that this account is an administrator on this box. I'm running the Windows command line as an administrator also. C:\>net use z: \\uwhc-sas2\SASHIMC…
JustBeingHelpful
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