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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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Kubernetes: kube-dns servers are not reachable (other pods are reachable)

this is an odd one. I've setup my K8s cluster, 1 master and 1 worker. It uses calico as cni, and everything looks to be working as expected (I'm able to deploy pods, services, etc). I'm able to reach my pods/services via IP, however I was trying to…
Dan V
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Unable to see computers on site to site VPN

Windows server: 192.168.0.10 Linux server: 192.168.0.1 Network printer: 192.168.0.30 192.168.0.0/24 site to site with 192.168.1.0/24 On a computer on second subnet (192.168.1.32) I can ping the Linux server & the network printer, even remote…
Hardened Criminal
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Could an incompatable Xeon processer cause only two of four RAM slots to be used?

Issue With everything installed correctly, only two of my four RAM sticks are being recognized with the BIOS. I checked the QVL for the motherboard, and the Xeon E5-2628L v3 that I am using is not listed. What I'm wondering is if a CPU on the QVL…
Ehryk
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All unregistered domains are being redirected to the same IP. What does this mean?

Whenever I make a request to an unregistered URL, I receive a 301 response code and I'm redirected to a specific IP. For example, in response to http GET http://dsfijewijfeif.com I get: HTTP/1.1 301 Moved Permanently Connection:…
Nasst
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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 ganglia metrics to see what happened. It was clear that…
hdanniel
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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, we changed our internal network infrastructure so…
Phil
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Diagnose Sudden Slowness on Linux

I have two identical Linux laptops (Core™ i7-4810MQ with 32GB RAM) both running Ubuntu 16.04. Running seemingly any command on machine 2 takes about 4-12 times as long as on machine 1, depending on the activity. This was noticed late last week while…
chadsgilbert
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How to diagnose end user DNS problems with my domain?

I work for a small part of a large organization that has been on the internet since dinosaur days (pre-CIDR). I'm confident our DNS is properly configured, but a tiny fraction (<1%) of our remote clients have chronic problems (either continuous or…
Foo Bar
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Cannot ping any Windows device on local network, but can ping *nix

Strange issue started yesterday: I cannot ping any Windows PC on my local network. I have (2) Windows 7 Pro devices, one of which was reimaged just before this issue started; (1) Windows 10 Education device; (1) Linux Mint 17.3 device; and an…
redbiscuit
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OpenVpn troubleshooting

I run a VPN with Openvpn on a Debian 8 server. It works kinda well. Sometimes (once a month or every 3 weveks) the tunnel stops running and I have to reboot the server to be able to connect to the vpn. I've looked in syslog, messages etc but…
avenetj
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Windows 7 (32-bit) Sysprep not running Unattend.XML but no error in logs

I am trying to Sysprep a Windows image that will run on identical hardware. The issue I'm facing is that the Unattend.XML file is somehow not running whatsoever, but the logs itself do not say anything about the Unattend.XML file having an error but…
Josh
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IPv6 connections from outside the LAN are timing out; what is blocking the connection?

as I understand with ipv6 there is no NAT so every client on a network will get a different public ip address (so there is no need for port forwarding). so I checked on my network and indeed every computer has a different public ipv6 address which I…
Timothy Werquin
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DHCP Troubleshooting

I am working at a branch office and have been tasked with changing out the DHCP scope to match the overall corporate IP address scheme. The main office assigned me an IP address range of 192.168.0.200 through 192.168.0.225. I changed the scope on…
user168300
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Windows Server 2008 Troubleshooting: Server falling over on a timely basis

All, This is a generic question, and I know it will upset some people, for which I apologise. I have recently taken a new role, and part of that role involves some sysadmin for Windows 2008 Servers (R2). One of these servers that I have to look at…
MHibbin
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PC Shutting Down Without Warning

I have a Windows 7 PC that is shutting down without warning, seemingly at random. Here are the symptoms and notes: PC seemingly turns off completely. After taking off the cover it turns out the fans continue to run after this happens. After this…
Phil Sandler
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