Questions tagged [troubleshooting]
Troubleshooting is a form of problem solving, often applied to repair failed products or processes.
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questions with no upvoted or accepted answers
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What would be causing "PowerShell.exe" to hang upon opening on multiple systems and/or how can I troubleshoot it?
What would be causing "PowerShell.exe" to hang upon opening on multiple systems?
I've waited for over 60 minutes, but it never fully starts. All it does is show the blue shell window with the ...
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Monit will not start my node js app
I have a problem with Monit that I use for monitoring of my Node.js app. I just moved from a single core machine to a multi core one. On both of them I run Ubuntu 11.10. On the old one this was ...
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How can I test network connectivity to a Keberos KDC (UDP/88)
How can I test network connectivity to a Keberos KDC (UDP/88)? Does Kerberos have a standard way to communicate that gives any output?
HTTP for example,
nc -v google.com 80
GET
will dump the ...
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WVD App attach launching windows file explorer
I'm trying to virtualize some apps and test the app attach feature with MSIX packages. I've followed all the steps, and expanded the MSIX into a VHD. I've uploaded the VHD and placed it in a hostpool /...
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how to debug/troubleshoot collectd?
I have an issue with custom script using exec plugin. From shell the script works well and nothing useful in /var/log/collectd.log.
LoadPlugin logfile
<Plugin logfile>
LogLevel info
...
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2
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1
answer
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Bind9 recursive queries have intermittent very long response times
I'm running BIND 9.8.1-P1 caching server on Ubuntu 12.04 LTS on kernel 3.2.0-86-generic-pae.
I've been banging my head against the wall trying to figure this out for weeks and I just have no idea ...
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0
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NGINX using 100% of the server CPU when testing with Blitz.io
I'm facing an issue here and after four days of looking around I decided to ask for some help here, after all a million heads can think a lot better than one.
I have a Ubuntu 14.04 server setup with ...
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How to prevent Windows Server 2008 R2 from automatically shutting down applications?
I have been running various processes over night on a Windows 2008 R2 AMD64 SP1 virtual server share via a VPN connection and remote desktop. Recently, I have been noticing that when I return in the ...
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How to troubleshoot occasional Apache 500 errors?
I have GET and POST requests, both HTTP 1.0 and 1.1, to diverse URLs, mostly running Wordpress(1), which occasionally fail with a 500(2). No user has ever encountered a 500 themselves, nor have ...
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Measure Upload Speed between a client and our server
We host a SAAS application specially customized for multiple clients. For one customer in particular -- they are reporting sporadic performance issues from various locations on their network, in ...
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Linux Server is slow on running some commands
I have a Linux server and ubuntu 20.04 is installed on it. Kernel version is 5.4.0-163-generic. 24 cores and 32GB RAM.
I have database running on this server which is working without any issue. ...
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1
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how to man-in-the-middle blocking/intercepting/editing all network traffic going to a single cabled device and a server
I need to completely block and intercept and alter all packets going between two devices. possibly i need to isolate one device and block/intercept/edit ALL traffic going to and from it if i cannot ...
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0
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Diagnosing increase in traffic hitting a Django web application
This question is about diagnosing the causes of elevated network traffic in an internet-facing web application.
Background: The web application in question is a Django-based forum where users upload ...
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AD domain rename problems, can't add server of the same name
I have inherited an active directory domain controller, and after adding a number of servers I found that I couldn't add a server with a specific name.
I since found out the admin who built the ...
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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,...
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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 ...
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0
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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 ...
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0
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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 ...
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0
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340
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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 ...
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0
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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 ...
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1
answer
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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. ...
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0
answers
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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 ...
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1
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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....
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1
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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 ...
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1
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0
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Apache taking up a lot of CPU while running request-tracker4
I am trying out a request-tracker installation on an EC2 micro instance. The specs for the micro instance are as follows
1) Ubuntu 12.04 64bit, 613MB RAM, 8GB Hard Drive
2) Running request-tracker 4....
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1
vote
1
answer
757
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Windows Server 2008 R2 Troubleshooting PID Leaking
One of our servers has been leaking PID like crazy. I wrote a simple scheduled script, and it seems that every day the highest PID increases by approx. 300'000. E.g., if on Aug.24 00:00 the highest ...
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0
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Slow connection to a shared .mdb file over a LAN on some machines only
A single client program on each of about 10 computers are sharing a .mdb file on a windows 7 machine.
The network is cabled and has a switch.
For no obvious reason the connection on 2 of these ...
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vote
3
answers
511
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Application getting VERY slow only in the morning: tools to track the culprit?
I have two Ubuntu Servers: one acting as db server (mysql) and file server and the application server.
Using this three service an application has been working flawlessly for months.
Now we've found ...
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1
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Troubleshoot DBMail in SQL Server 2005
On a SQL Server 2005 machine, I have DBMail setup and correctly configured. I am able to use "Notify Operator" and EXEC msdb.dbo.sp_send_dbmail to queue emails.
But the problem is the queued mails ...
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2
answers
277
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troubleshooting a printer problem
I have a large Kyocera Printer/Scanner/Copier machine in a office with three PCs (all plugged into a lan via router. The three PCs all have individual printers (inkJets) hooked directly via printer ...
user710201
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0
answers
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ADFS 2.0 Errors Event ID 184 & 364
I have ADFS servers set up and each component such as in URN, relay, claims etc. in place, but am getting this error massage
"There was a problem accessing the site. Try to browse to the site ...
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1
answer
453
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How do I troubleshoot network connectivity problems in windows?
I'd really like to understand how to debug my network connectivity issues, but everything I find on the internet is either for basic users on "How to add a wireless network" or it's people talking ...
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0
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Troubleshooting slow write performance on hard drive
Issue
I have 4 SSDs in a RAID0 array. I notice recently that when I am doing anything while on the array mountpoint I will run into these short glitches/pauses. For example, assume I am editing a file ...
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Forcing freeradius to use 802.1x-2010
I am trying to troubleshoot a remote problem, where a piece of hardware is unable to connect using enterprise WPA. From the remote logs, it seems that the network is using 802.1X-2010, while the ...
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ICSharpCode.sharpziplib.zip.zipexception. Cannot find central directory
Every time we run a certain commercial software in a Windows Server 2019 we get a pop-up window with this error:
ICSharpCode.sharpziplib.zip.zipexception. Cannot find central directory
It looks like ...
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0
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Double Nginx installation issue
It seems i somehow have two installations of Nginx on a server, Nginx Amplify reports two installations (see screenshot), one of them not sending updates of course, and occasionally when restarting ...
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1
answer
65
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Troubleshooting K8 cluster with StatefulSets that don't respond to scales
I currently have a Kubernetes environment which is generally not behaving (slow response times to commands, pods not being scheduled, etc).
I've not been able to find any trouble shooting information ...
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0
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How to figure out what makes a Linux workstation slow?
We have this ThinkPad X240, 8GiB of RAM, an i5 4300U, and a Toshiba SATA SSD. The machine is running Linux Mint 20.3.
The user complains that it is very slow. Mostly when the browser is open and ...
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0
answers
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SQL DB failing to send server email - intermittent
Recently, we noticed an issue in SASS 2014 logs regarding the failure of some emails to send:
The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using ...
0
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1
answer
564
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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 ...
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0
answers
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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 ...
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1
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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 ...
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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 ...
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votes
1
answer
4k
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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 ...
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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 ...
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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 ...
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How to troubleshoot internet down every day?
Every day the server is unreachable and I need to unplug and replug it in. I cannot ping it and all web services are down. After a reboot the internet is back on again.
There are no cronjobs
fail2ban ...
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2
answers
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HP ML350 G6 will not power on
I have no lights on MB or back of power supply. I have replaced power supply and added a redundant power supply. I replaced PD board or backplane whatever you want to call it. Still same result. ...
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1
answer
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nginx workers stack at 100% usage after X random days
I am facing a strange incident, under which my two nginx workers suddenly get stack at 100% of CPU usage after a random number of days and at the same web traffic, under which they are behaving fine ...
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answers
490
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Diagnosing NFSv4 Authentication Issues
I've got a couple of NFSv4 shares (with Kerberos authentication). Most of the time they work quite well, but when there's an issue they can be a pain to fix.
I put this down to them being quite ...
