Questions tagged [troubleshooting]

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

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6 votes
1 answer
11k views

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 ...
2 votes
2 answers
9k views

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 ...
0 votes
1 answer
4k views

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 ...
0 votes
1 answer
391 views

How to fix a corrupt server (after upgrade) with chroot in rescue-mode over ssh

First, I'm NOT trying to create a ssh-jail. Here's the situation I decided to upgrade my server from Debian 9 to 12. But now I'm locked out. I went step by step : from 9 to 10, 10 to 11 and 11 to 12, ...
0 votes
2 answers
5k views

Could not continue scan with NOLOCK due to data movement during installation

I am running Windows Server 2008 Standard Edition R2 x64 and I installed SQL Server 2008 Developer Edition. All of the preliminary checks run fine (Apart from a warning about Windows Firewall and ...
0 votes
0 answers
39 views

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 ...
1 vote
0 answers
194 views

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. ...
2 votes
3 answers
916 views

Diagnosing system which persistently recognises SATA drives but refusing to recognise SAS drive or its replacement?

I've done a fair bit of troubleshooting but I'm completely at a loss what could be going on. Hardware / platform Supermicro X10SRi-F motherboard EVGA 850W G2 PSU (one of the highest rated for power ...
0 votes
0 answers
64 views

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 ...
0 votes
2 answers
727 views

Redis Stack Server - Cannot Change Data Dir (Docker/Kubernetes)

I am trying to get redis up and running in a Kubernetes environment. I’ve done many tutorials, read the documentation, etc. etc. I need to have the .rdb file and the .aof file(s) saved in a Persistent ...
0 votes
0 answers
376 views

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 ...
0 votes
1 answer
59 views

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 ...
0 votes
0 answers
72 views

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 ...
0 votes
0 answers
124 views

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 ...
1 vote
1 answer
3k views

How to troubleshoot LACP flapping interface triggered by layer 3 IP Address. (Juniper)

I am currently working on solving a network issue that has led to network outages across my organization. (I have included a picture of our simple topology below). Our network consists of a Router/...
0 votes
2 answers
44 views

Server administration issue [closed]

How can you troubleshoot a slow server response time? My server performance is deteriorating so fastly. I've tried fixing server software and configurations. Also checked with network connectivity. It ...
3 votes
1 answer
568 views

Diagnosing samba fileshare issues with TP-Link router

I have a LAN with a TP-Link router (AXE5400, 3 months old), a Mac Mini (2020, osX Monterey) as file-server, and Windows 11 Laptop and a Macbook Pro laptop (c. 2020/2022). Both the Windows and Macbook ...
11 votes
6 answers
64k views

Best way to troubleshoot apache not starting?

We have recently gotten a backup server to mirror all our data onto in case the primary server goes down. I've gotten all the sites data updated through rsync, and all the apache config and databases ...
1 vote
1 answer
313 views

DHeapmon not reporting expected number of total desktops in IIS6

Hope someone can help me make sense of this. I'm trying to debug some COM+ errors we see in our production environment and a few of them report that the desktop heap is exhausted, so I installed ...
1 vote
2 answers
30k views

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 ...
0 votes
1 answer
758 views

Ansible trouble while launching an exe through win_command

I'm currently writing a playbook about uninstalling Fusion Inventory Agent and then deploy GLPI agent 1.4 on Windows Server 2016-2022. For all the tests i detail below, i use my domain account which ...
1 vote
1 answer
859 views

COM+/Desktop Heap errors in IIS affecting sites at random?

We have a Win2K3 server that is hosting 30+ sites. Each site is configured to have its own unique application pool -- so that we can manually recycle specific sites if needed and not kill sessions ...
2 votes
2 answers
929 views

Website inaccessible until host is pinged from client (on a class A subnet)

There is this really weird issue on the internal network, this happens constantly to "random" machines. Machine (client) boots up, goes to some-intern-website-which-is-not-accessible-from-internet....
0 votes
2 answers
2k views

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. ...
1 vote
1 answer
4k views

How can I see the memory content of nginx process?

Nginx 1.20.1 server working as a reverse proxy consuming a lot o memory and making the service stop requiring a system reboot. ModSecurity library is also configured on Nginx. You can see in the next ...
0 votes
1 answer
3k views

Office 365 In-Place Hold preventing me from deleting user

I am using AD Connect to synchronize my on-premises Active Directory to our Office 365 tenant. I tried disabling a user from on-premises and then synchronizing to O365. However, it seems to have ...
1 vote
1 answer
2k views

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....
0 votes
1 answer
1k views

Can't boot VM after P2V or ghost - Linux 2.6

I got this old machine that runs on a p2 400 and a Linux Debian 3.1 with kernel 2.6.8 and since it has modified binaries due to internal undocumented changes in the code, migrating off manually isn't ...
0 votes
1 answer
2k views

MySQL 5.0 not logging aborted connections in general log

I know there is a bug in MySQL 5.0 which prevents aborted connections from being logged in the error log (http://bugs.mysql.com/bug.php?id=24761). However, aborted connections should still be logged ...
0 votes
1 answer
93 views

IT counterpart to medicine's ICD-10/DSM-IV for diagnosing problems?

I've often thought about why there aren't any diagnostics manual on a very broad level, a counterpart to the medical DSM-IV/ICD-10 manuals. From a troubleshooting perspective, the work of an ...
2 votes
5 answers
9k views

Ubuntu 9.10: how do I troubleshoot a startup script that doesn't appear to run?

I've created a bash script 'foo'. I've made that script executable with chmod+x and added it the the start-up by running sudo update-rc.d foo defaults 80 Despite that, it doesn't appear to be ...
47 votes
4 answers
122k views

What is the ibdata1 file in my /var/lib/mysql directory?

Logging in to my Webmin control panel, I noticed that virtually all of my disk space is full. I searched for the ten largest files/ directories on my system and found that a file called ibdata1 is ...
0 votes
1 answer
267 views

Unable to reach different network using ubuntu server as a router in gns3

My network is shown in the picture, I am trying to ping from a windows vm to an ubuntu vm in a gns3 network. But I get: "Destination host unreachable". Network: https://i.stack.imgur.com/...
0 votes
1 answer
543 views

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 ...
2 votes
3 answers
3k views

Using ENV variables in Postfix and Dovecot configuration files

I'm trying to dockerize my mailing server and I'm having some troubles regarding how am I supposed to use environment variables inside Postfix and Dovecot configuration files (I'm using the latest ...
5 votes
5 answers
29k views

Fixing BIND9 rndc error "connection to remote host closed"

I just made some changes to a DNS zone in Webmin and clicked the "Apply Changes" button. I received the error message: rndc: connection to remote host closed This may indicate that the remote ...
1 vote
0 answers
11 views

Block device suddenly full; can't identify a single file as culprit and SMART shows no drive errors [duplicate]

Setup Ubuntu 20.04 Dell PowerEdge R820 [PERC H710] 2x Virtual Drives (RAID-1 Boot, RAID-0 Work Drive) Everything been fine for 6 months No preceeding even, just suddenly, drive full. Details... This ...
5 votes
1 answer
5k views

Machine with bonded interface does not receive multicast packets on all slave interfaces

After an upgrade of our machines from RHEL 6.6 to RHEL 6.7 we observed a problem where 4 of our 30 machines only receive multicast traffic on one of their two slave interfaces. It is unclear if the ...
1 vote
1 answer
3k views

No incoming traffic on Hyper-V Adapter inside VM

I have a very annoying problem with my Hyper-V setup and it's bugging me quite a bit, because I can't figure out why. My Hyper-V Host is a Windows Server 2019 and has three network adapters. Adapter 1 ...
1 vote
0 answers
279 views

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 ...
0 votes
1 answer
77 views

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 ...
5 votes
2 answers
2k views

Can tone ethernet cable into patch panel but it's not working

So we recently had to two major issues happen at a location. We had a lightning strike hit the building We updated switches after this lightning strike Now one thing that was 'hit' was a SOHO router....
22 votes
9 answers
17k views

Your troubleshooting rules, approach to troubleshooting? [closed]

Do you have any general rules that you fall back on when you troubleshoot a difficult network/hardware/software problem? Eg: "I isolate the source of the problem by testing a peripheral with a second ...
0 votes
0 answers
241 views

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 ...
0 votes
1 answer
284 views

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 ...
22 votes
24 answers
258k views

Unable to logoff, disconnect, or reset terminal server user in production environment

I'm looking for some ideas on how to disconnect, logoff, or reset a user's session in a 2008 Terminal Server (unable to login as the user either as it is completely locked-up). This is a production ...
1 vote
1 answer
39 views

Has anyone cloned an HDD for a Macintosh IIvx?

Where I work as a sysadmin, we have an old Macintosh IIvx that is the only one left in the world with an obscure program on it that will cost the company a ton of money if they can't use it. Well, the ...
1 vote
0 answers
2k views

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 ...
0 votes
1 answer
349 views

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 ...
2 votes
0 answers
302 views

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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