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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 detect Router or Transmission line error

I have a large LAN at my company. I suspect that there is a failure of a router or of a transmission line connecting routers. I want to narrow down the search, where is the fault. How could I narrow down the location of the problem.
Vaibhav Jain
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How can I rename a file in novell sever?

My Server is using netware 4.X, I am one of their client. I can map the drive in F:\ for example, and I want to rename the file which is located in F:\ , but I get follow error: Duplicate file name or file in use. I can ensure that I type the file…
hihi
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The network routes A.com and sub.A.com so differently

Route is based on IP, right? How does it possible to route my packets so differently? One is success, but another is not. # traceroute A.com traceroute to A.com (1.2.3.4), 30 hops max, 60 byte packets 1 ... 2 ... 3 .. 4 A.com # traceroute…
Cheng
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Unable to Install Appgate on Kali Due to libicu Dependency Issue

I'm trying o install the Appgate VPN client on the latest version of Kali. I downloaded the Ubuntu .deb file from from https://www.appgate.com/support/software-defined-perimeter-support/client. When I attempt to install the file I get a dependency…
user1339242
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Sun X6270 LED Status Light Rapid Blink

we have a Sun X6270 blade server that, after a power outage, won't boot and its green power LED is rapidly blinking (0.1s-ish). This is not documented in the manual, and we got the server secondhand a long time ago so I can't sign up for Oracle…
pjahelka
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How to troubleshoot a hung php process on epoll_wait(fd, EPOLLHUP?

On one of the Linux jenkins agent node, there are some PHP jobs that get stuck for days and I tried to troubleshoot that using strace command and I see the following output epoll_wait(8, [{EPOLLHUP, {u32=2914329680, u64=94792842552400}}], 1, 5000) =…
Jayabalan Bala
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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/2xR6S.png I am trying to use ubuntu server 18.04 as a…
Sergio Loza
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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 cannot seem to wrap my head around the process. We…
stefjay
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MariaDB Replication Master Slave Login Slave Login Forbidden

Good day everybody, As a newbie, I apologize if I'm doing this wrong. About the situation: We have two physical Ubuntu servers. These are in the same network and act as master/slave servers. The replication of the databases and thus the approx. 300…
S.B
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Log TCP Client port on apache mod_proxy

Using an Apache 2.4 Reverse Proxy (with mod_proxy) that connects to a backend HTTP service we have the following(simplified) series of TCP connections: client ClientIP:random_port1 ---> reverse_proxy --->
trikelef
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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
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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 Network (private network), but I can connect using my…
Andre
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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 the two servers that are in a cluster). The…
John Dalsgaard
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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
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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 are not received. $ ping 138.68.93.123 PING…
truvaking
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