Server Fault Stack Exchange
Server Fault Stack Exchange

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.

357 questions
0
votes
1 answer

Centos 7 OpenJDK Upgrade Confusion

Wanted to pick someone else’s brain on an issue I’m having and getting nowhere with. We have an older Linux server in our environment and I am looking to patch our openjdk to the Latest versions but cannot seem to wrap my head around the process. We…
stefjay
  • 1
0
votes
1 answer

How to query linux kernel which storage-related operations are currently being run on the level of FS / block layer / SATA controller?

Every once in a while, our Linux LAMP server (using PHP-FPM, XFS on thin LVM on HW RAID, Centos8) becomes inaccessible and stops responding to HTTP(S) requests. Via centralized logging we found out that in those cases, load average quickly shoots up…
Ján Lalinský
  • 282
  • 1
  • 11
0
votes
0 answers

After upgrade from MongoDB 4.x to 5.0.2 shows Connection Refused trying to connect BD from Private Network

I have upgraded my MongoDB from 4.x to 5.0.2 into a Ubuntu 20.04 system. This server is an AWS EC2 Instance. After upgrade I can't connect my applications from other ec2 instances using the same Network (private network), but I can connect using my…
Andre
  • 1
0
votes
1 answer

Something is closing connections in my CentOS VMs - how to best troubleshoot?

I have a setup with 3 VMs (1 application server on CentOS6 and 2 database servers on CentOS7). The last 1-2 weeks we have had issues with timeouts when connecting to the database servers (and between the two servers that are in a cluster). The…
John Dalsgaard
  • 203
  • 3
  • 11
0
votes
1 answer

router or reverse proxy - network failure

I have an edgerouter x sfp as the main router to the internet. To this router a server is connected with a reverse proxy docker running called swag eg. letsencrypt which I use to access nextcloud and several ngnix dockers from the internet. This…
Andreas
  • 1
  • 3
0
votes
0 answers

Remote host can be connected to via SSH but cannot connect to the Internet

I am trying to find out why a remote host with which I can connect via SSH cannot connect to the internet. When I try to ping said server, it will answer back with 1 ping and every subsequent packets are not received. $ ping 138.68.93.123 PING…
truvaking
  • 103
  • 3
0
votes
1 answer

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
  • 119
  • 2
  • 4
0
votes
1 answer

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
  • 1
0
votes
0 answers

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
  • 135
  • 5
0
votes
0 answers

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
  • 1
0
votes
2 answers

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
  • 4,293
  • 23
  • 25
0
votes
7 answers

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
  • 1,013
  • 2
  • 12
  • 16
-1
votes
1 answer

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
  • 109
  • 2
-1
votes
1 answer

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
  • 161
  • 8
-1
votes
2 answers

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
  • 3
  • 4
1 2 3
…
23
24