Questions tagged [diagnostic]

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How to make dig to show IP addresses it is sending queries to?

By default when DNS servers do not respond dig does not show any information about the queries being sent. I can use the +qr option to see each query being sent: $ dig +qr archive.ubuntu.com ; <&...
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Diagnosing a Linux routing issue: multiple external IPs and several internal subnets with multiple routing tables

This is my first post on stack exchange. First, I'd like to thank this community for over my computer engineering journey I have learned many things here. :) With this post I am mainly looking for ...
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1 vote
1 answer
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ARM Template - Azure SQL Database Diagnostics & Log Analytics Workspace

Using an ARM Template I want to enable diagnostics settings for my Azure SQL Database and have that data stored in a Log Analytics workspace I created. I want to enable the errors, timeouts, blocks ...
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sshfs - howto view load and find bottlenecks

I got 2 dirs mounted by sshfs from remove server. And suspect those make my app so slowly (app generate many i/o operations in this). I can use fdisk/iostat/iotop for diagnostic HDDs bottlenecks, but ...
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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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Is it possible to watch the tcp connection packets on a connect call from the command line in linux?

Basically I want to do something like strace ssh user@host and instead of seeing the system calls, I want to watch the tcp connection packets as the connection is established. I'm having this weird ...
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Azure App Service Tiers that Permanently Store Diagnostics Data

I need to permanently store diagnostic data for my webapp. I'm currently running in the Basic tier. If I upgrade to standard or premium, will either of those guarantee permanent diagnostic data ...
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2 votes
1 answer
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Get MSI log for Active Setup

One of my users has Outlook unable to start with "Cannot start Microsoft Office Outlook. Cannot open the Outlook Window" and I've already ruled out existing add-ins. (This is just for background ...
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1 answer
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Serial over USB during boot

I am currently trying to debug the boot sequence of Xen, and past a certain point, the only way to do it is over a serial connection. Now, on the laptop I'm using there exists no serial port nor an ...
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SQL Service keeps falling over

We have a Windows Server 2012 R2 Datacenter running SQL Server 2016 (SP1) The SQL Service fails randomly with the following error in the Logs :- Computer type is Intel(R) Xeon(R) CPU E5-2660 0 @ 2....
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3 answers
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How to list Windows process timers?

I have a Windows system that exposes some weird activity at regular timer interval and suspect this originates in a running process. Is there a tool to list all process timers? No matter it is CLI or ...
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Microsoft Azure Linux Diagnostic Extension issue

I have enabled LAD in azure Linux VM in ASM mode and have used below command: azure vm extension set ubuntuclassic LinuxDiagnostic Microsoft.Azure.Diagnostics '3.0' --private-config-path private.json -...
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Need help diagnosing dell c6100 - No POST

Hi Server Fault Community, I have 2 nodes in my dell c6100 that are not POSTing, it's the top two nodes (1 & 3). The bottom 2 DO turn on (2 & 4). I need some help identifying which part I ...
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1 vote
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How to set up an end-to-end SNMP data collection system to cloud?

Aim: We are creating a cloud server which will collect diagnostic data (like bytes exchanged, SNR) from remote SNMP enabled network devices (like Routers, Switches). The SNMP devices may be located ...
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How can one get a UDE report from Microsoft Fixit Center Pro?

As per this video anybody is supposed to be able to upload their server's logs to the Microsoft Fixit center Pro and get an Automated diagnostic report called UDE. http://channel9.msdn.com/Shows/...
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8 votes
1 answer
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Identifying what caused a server reboot

I have an HP ProLiant DL380p Gen8 that is running VMWare ESXi 5.5. It has been rebooting itself at seemingly random intervals for the past 24 hours. There is only a single VM running, and even if I ...
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3 answers
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How do I detect what is changing file ownership on Linux?

I have inherited a bunch of Linux (Ubuntu Precise) servers and am currently having problems with the ownership of a folder changing to "root" fairly often. We run puppet, which changes the ownership ...
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9 votes
2 answers
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Diagnosing slow active directory logins

I'm having a hard time diagnosing intermittent slow logins on domain PCs. A bit of information about the network that has this problem: My domain spans 5 sites, all with VPN connections. DCs are a ...
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2 votes
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How to diagnose failed drive on server with raid storage controller?

I have problem with one of my Dell PowerEdge R210. Machine is with Centos 6, today system logs started to inform that the hard drive is failing. Jan 6 03:20:12 centos6 kernel: LSI Debug log info ...
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Resert IBM system x3650 fault led

I got OVERSPEC, PS1 and PS2 fault led on my x3650. I tried to replace one PS but nothing changes. The power supplyp seems to work properly and it is very strange to broke both PS at the same time. I ...
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1 answer
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Should I run rsop as administrator or as domain user?

I have to diagnostic some AD policy on a windows7 client. So I want run rsop but I dont know if I have to run it as administrator (local) or as domain limited user.
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3 answers
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Server memory configuration after upgrade

I have an IBM 346 server that can support up to 16GB of memory. It previously had 8GB installed (8x 1GB slots) and was working fine. I have upgraded it to 16GB using 8x 2GB slots. However now when the ...
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2 answers
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Why is Postgres sitting 95% idle, with no file I/O?

I have a TileMill/PostGIS stack running on an 8 core Ubuntu 12.04 VM on an OpenStack cloud. It's a rebuild of a very similar system which was running nicely on very similar hardware (same cloud, but ...
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How can i find out what crashed my Windows Server 2008 R2 box?

My file server just went belly up and I can't seem to figure out why. Perhaps I'm naive but when these things happen I can typically look through my System, Application or Security Event Viewer log ...
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How to test SCSI drives faulty or not?

I have 10 scsi drives which are used. How do I test them to ensure they are working correctly? Some have red stickers presumably indicating they are faulty. The server I have access to is an IBM with ...
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Is there an app that can provide details about wifi access point config?

I'm wondering if there is an easier way to determine of the following parameters of a wifi network. For users who already have say a laptop connected to a wifi network. Does wifi network support PS-...
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How to start a data collector upon high CPU load condition?

I have a Windows 2008R2 server that experience high CPU load for several minutes about once every couple of weeks. Unfortunately, when these events occurs, logging into the system through RDP or at ...
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25 votes
3 answers
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How to test a connection without telnet? [closed]

I'm trying to test whether machine A can connect to machine B on certain ports. The sysadmins of machine A have seen fit to remove the telnet command. What would be a convenient replacement? Machine A ...
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4 votes
1 answer
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Is there a complete reference for HP's diagnostic port 84 and/or port 85 codes?

The HP ProLiant DL580 systems (G5 is the one I'm interested in at the moment) have a two-digit 7-segment display on the system board (visible only inside the chassis) which displays various diagnostic ...
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Cisco ASA Becomes Non-responsive

I have a client that has a Cisco ASA 5505 that sits between their router (provides VOIP phone service) and their Cisco 3550 (Very old version of IOS) that they use as a "Core" switch. This works well ...
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Hardware Diagnosis: Different Ram, Same Memtest Failure

Trying to diagnose random hardware freezes and did the natural thing; started memtesting everything. DDR400 DDR2 Ram CAS 5-5-5-18 Four sets of sticks; 2x2GB PNY's and 2x1GB Elixirs So far I've ...
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1 answer
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What diagnostic tools for diagnosing problems on Ubuntu? [closed]

I recently had an ubuntu server slow to its knees, and when trying to figure out why I realized it didn't have iostat installed. The system was stressed out to the point where I couldn't install the ...
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2 votes
3 answers
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memtest86+ crashing on server

We have a few DELL 1950 servers. One of those servers has CentOS6.3 and it's randomly rebooting, so I suspected it was hardware (no log generated). The other four servers do not randomly reboot. We ...
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1 vote
2 answers
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Are my disks within this MSA storage failing?

When I go into my HP Array Configuration Utility, there is no errors and and warnings. No visible amber lights either. Should I swap out the disks? This Windows server lost the storage about 4 times ...
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8 votes
5 answers
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Methods for analyzing Red Hat sosreport output?

For some time (since EL 4.6), Red Hat has embedded a system report and troubleshooting tool into the operating system. The tool, sosreport, collects system information and settings and bundles it into ...
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8 votes
10 answers
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Diagnosing permission problems with Cobian Backup to network share

I'm running the latest Cobian 11. I have a Synology DS412 NAS. All of my machines (Mac and Windows) access this just fine when I'm logged in and I browse to it manually. I have Cobian installed as a ...
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2 votes
2 answers
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Diagnosing Random Network Lag

I'm having trouble diagnosing some random lag on a 6 server LAMP cluster serving a MediaWiki site. While we're serving some 100 pages/sec the servers themselves are running fine with less than 0.5 ...
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-1 votes
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CPU Diagnostic Software

Is there any decent (preferably free) CPU diagnostic software out there? It would need to be either *nix compatible or bootable because this is an ESXi server, and does not run Windows or a proper GUI....
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3 answers
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Looking for a diagnostic DVD or CD creation tool [closed]

I am looking for a diagnostic DVD utility (which tests hardware, create partition, fix partition, etc..) which can boot directly when the computer start. I am looking a solution which support ...
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1 vote
4 answers
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What is the easiest way to run a boot level surface scan?

I have a PowerEdge 1850 running two SCSI Ultra 320 drives (10k 73gb). I am looking for recommendations on boot disks / methods to run a boot time surface scan. I would like to do this at boot time ...
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1 vote
1 answer
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Tools to help identify unknown server issue

We've been struggling to identify a issue where all our bespoke systems crash at least once a day. We haven't changed all our systems to we're trying to pin down what else has changed which is ...
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4 votes
2 answers
6k views

Diagnosing possible intermittent network failures/slowdowns; tool?

Is there a simple (linux cli) tool that I can run continuously for a period of time to see if the there are any connection problems between two specific network endpoints over the wan? One remote ...
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6 votes
1 answer
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How to troubleshoot a hanging Linux machine [closed]

There is this popular job interview question: Given a machine hangup (let's say RHEL) how do you trouble shoot the problem? My answer would be: 1) I'd use (what is the name of that server BIOS ...
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2 votes
3 answers
195 views

Are there any good (hopefully free) hardware diagnostic utilities available?

A diag utility that runs from CD or USB would be my preference. I'm having some trouble with a desktop PC that I support, and I haven't been able to figure out what is going on with it. I used ...
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0 votes
1 answer
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Server diagnostic tools?

I have an Openfiler server that is misbehaving. Im looking for a bootable CD or similar that will tell me whether there are memory, RAID controller or similar issues.
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8 votes
2 answers
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How to interpret traceroute / output of MTR?

I have been running MTR to/from one of my servers and noticed something that looks odd to me. Because I am not really into this I will give you three outputs: This is from the server to my home ...
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11 votes
3 answers
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How to diagnose frequent segfaults

My server is logging frequent segmentation faults to /var/log/kern.log in different tools. So far I've seen them in Perl, PHP and rsync. All installed software is up-to-date Debian packages. Here's an ...
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0 votes
1 answer
584 views

Random hard drive activity on server 2008 r2

I have Windows Server R2 setup, just as a simple webserver, although it has not gone live yet and is not connected to the network. I notice quite often some random hard disk activity, that will make ...
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5 answers
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What does "-k start" mean in the output of ps command

I try to run an apache instance. It doesn't run properly. I am trying to get some diagnostic information. I gave ps command and the apache instance that don't run properly are output with -k start. ...
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2 votes
3 answers
5k views

(How) can I use syslog to diagnose mysterious crashes?

I run a LAMP stack on Ubuntu server. Twice today it has ground to a halt and required a hard reboot. Prior to this it had been stable for many months. It has been about a fortnight since the last ...
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