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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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How to diagnose UDP connectivity issues?

I have an OpenVPN connection which was initially over UDP. After some time I started to have serious hiccups when running ssh inside that tunnel. As seen from inside the tunnel, ssh packets were lost, there were Host Unreachable ICMP messages - all…
WoJ
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Why does LAN stops working if switch is connected to two upfeeds?is

If I connect my switch to two upstream feeds from my ISP, my internal LAN stops functioning (see illustration below). What is it in the TCP/IP protocol that is disrupted to cause the above? +--------+ | | …
boardrider
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Error: No space left on device: (deleted)/dev/zero

**** Hoster something changed on hypervizor but said, that nothing was changed. The problem is not on the server anymore... **** Could someone help me to solve the following problem: If I want to restart the daemon, I have the notification: Error:…
kbu
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Periods of high packet loss, two ethernet cables plugged into TWC modem

A small business for which I am the system administrator has been experiencing intermittent internet dropouts. There seems to be no pattern to the dropouts — sometimes there is nothing for a week, and other times it will drop out dozens of times in…
user3476044
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Strange behavior from App-V virtualized application - can't start new instance until all others are closed

I first must apologize for the vagueness of this. It is rather hard to pin down, which is why I turn to posting this. The environment is Windows 2012 R2 Citrix 7.16 servers, multi-tenant (which is the reason for App-V being used). First a few things…
Gomibushi
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Troubleshoot random Network disconnection (USB Modem)

In general how to debug random network disconnection issues? I am working on Intel Edison board which is connected to the internet via a Huawei E8231 USB Modem. Few devices loose the internet connection and fail to get back online while some are…
Sandeep
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What network setting could impact iperf3 results?

I am making some bandwidth tests to set a baseline for some other tests and I have a behaviour I cannot understand. The tests are done with iperf3 on Linux (with and without -R to get both up- and down-stream). I called the machines "home" and…
WoJ
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How to troubleshoot rx_tcp_udp_chksum_err

Recently our Nagios started reported network interface errors on few servers and I have no idea how to identify what caused these errors. I collected some information here and hope someone can provide some advice. eth1 Link encap:Ethernet …
Ask and Learn
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Ubuntu 14.04 becomes unresponsive after 2-12 hours + of idle time

As the title says my Ubuntu 14.04 server becomes unresponsive after a period of being idle. It is going to be an NGNX proxy box, but not taking production traffic yet for obvious reasons. It ran for about a month without issue, while I was waiting…
Jeff Gebhardt - MSFT
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Looking for a workaround to install a personal certificate in a mandatory profile

I have recently set up mandatory profiles for a PC image I am creating and I have been able to set up everything I need in the profiles via group policy with the exception of one major item. Apparently mandatory profiles do not allow the…
Jacob skidmore
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Why is Group Policy not applying a desktop wallpaper setting?

I am configuring Group Policy in Windows Server 2008 R2 Enterprise to apply Desktop Wallpaper to Users and Computer in OU called HR. I shared the folder over the network using share and storage management. I configured the desktop wallpaper settings…
John Ambers
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Win2012r2 Services Recovery Tab documenation refuses to launch

Services Recovery Tab Help will not launch. [ On the "Recovery" tab in Windows Services.msc, clicking on "Help me set up recovery actions" results in "An internal error occurred (INVALID_HANDLE)" Original title was "Win2012r2 Services Recovery…
rjt
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Sun X4150 not powering up via power button

What I have I have a Sun Server X4150 ( https://docs.oracle.com/cd/E19121-01/sf.x4150/820-1852-13/doradi-overview.html ) which I have set up in a research environment (I'm testing various OSs and RAID types). Currently I have Ubuntu installed on it…
Madivad
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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 seems that the client can't assign itself an address…
sold
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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 certain situations all of these values are low and…
frankadelic
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