The troubleshooting tag has no wiki summary.
0
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1answer
20 views
How to troubleshoot banned connections on OS X / Ubuntu
I have an ubuntu 11.10 VM running on an OSX machine.
Every once in a while some services become inaccessible from specific IPs (e.g. sometimes just ssh is blocked, and sometimes both ssh and https.)
...
1
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3answers
158 views
How to investigate unexpected Linux server shut down?
In a new Xeon 55XX server with 4xSSD at raid 10 with Debian 6, I have experienced 2 random shut downs within two weeks after the server being built. Looking at bandwidth logs before shut down does not ...
2
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0answers
35 views
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 ...
1
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0answers
53 views
alfresco, tomcat crashes on startup, no clues in the logs
I have installed an alfresco community edition 4.0 on a Win 2003 R2 with 3GB of RAM.
I've used alfresco for some hours, i've created a user, uploaded some documents. But now, restarting it, tomcat ...
7
votes
2answers
166 views
Troubleshooting strategy for very poor iSCSI/NFS performance
We have a new Synology RS3412RPxs that offers iSCSI targets to three Windows 2008 R2 boxes and NFS to one OpenBSD 5.0 box.
Logging into the RS3412 with ssh and reading/writing both small files and ...
3
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3answers
55 views
What could cause two devices to refuse to link?
This is a curious case where all the devices at hand will link with one another, except for two that just won't detect one another. One device is a single board computer (SBC) with a gigabit nic, the ...
1
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2answers
151 views
Troubleshooting ESXi hardware freeze with PCI Passthrough
I have a Supermicro X9SCM board with a Atheros AR5008 PCI Express card (D-LINK DWA-556, Device=0024&Vendor=168C). The card can successfully be marked for PCI passthrough in ESXi (I tried versions ...
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0answers
38 views
Cobalt Qube 3 Unresponsive
I recently bought a used Cobalt Qube 3 server off of eBay. The seller listed it as working before it was shipped. After starting it up for the first time, the "Cobalt Networks" logo scrolled across ...
-3
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2answers
54 views
Server keeps crashing [closed]
I just recently rented a new server which is being used for hosting files and converting them. however for some reason the server keeps crashing every few hours, how can I find out the reason why my ...
0
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3answers
96 views
How to verify DNS change is active
I have DNS service from a third party, which provides an webapp for changing the DNS. I changed the DNS settings to point one of the domains I control to our new IP, but it's been hours and there was ...
-1
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1answer
25 views
PC Shutting Down Without Warning [closed]
I have a Windows 7 PC that is shutting down without warning, seemingly at random. Here are the symptoms and notes:
PC seemingly turns off completely. After taking off the cover it turns out the ...
2
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0answers
123 views
Fortinet: Is there any equivalent of the ASA's packet-tracer command?
I would like to know if there is not Fortigates an equivalent of the packet-tracer command that we can find on the ASA.
Here is an example of execution for those who don't know it:
NAT and pass :
...
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0answers
28 views
Hight Threads in the LAMP server. Troubleshooting
So I was wondering around the web, and cant seem to find any decent Treads trouble shooting guide. Ans at the same time my server spiked yo 3k threads. So maybe someone could give me some tips, or ...
0
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1answer
39 views
what tool to remotely diagnose server connections issues for multi-location, multi-platform, varying competency end users?
(you might intuitively think that this is a desktop type question, however I intend to use this network of clients effectively as monitoring agents for the servers, hence its relevancy to server ...
1
vote
1answer
83 views
WHEN does IIS 6.0 Application Pool CRASH with memory issues?
We've been having Out of Memory issues with our mixed classic ASP/.NET site for quite some time. Basically, we see a couple of different cases:
Some request (SQL query that returns a LARGE ...
0
votes
1answer
63 views
Cisco 878 Router Physical Layer troubleshooting
My problem:
Upon connecting the FastEthernet0 with a straight-through cable to a Catalyst switch, the line protocol comes up briefly and then goes down. Interface goes down too, I now have this on my ...
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0answers
44 views
CISCO - Configuring Application Inspection (Fixup) How to do it for SMTP?
We are getting error in EHLO Command from outside the Router and We are getting
220 ******* kind of message instead of welcome message which is configured in the Mail Server.
many suggesting its a
...
1
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0answers
59 views
How to troubleshoot intermittent winsock 10054 errors on Windows Server 2003 SP2
We are getting 10054 errors in a couple of our applications on one server running Windows Server 2003 SP2. This happens intermittently, and we also have other similar servers running the same ...
0
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1answer
85 views
What factors can disrupt a VSAT connection?
In some locations, the only option for an internet connection is to use some form of Satellite dish. Like any wireless medium these can be quite tricky to troubleshoot.
What factors have you ...
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0answers
51 views
Hanging between Oracle client and Shadow Process
We are having an occasional (ie non-reproducible) issue where the Oracle client process (EnterpriseOne kernel process) and the Oracle shadow process seem to get out of sync. I perform a stack dump of ...
0
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1answer
78 views
What sort of network problems can a single NIC host cause?
A remote office has a Cisco ASA 5505 connecting the LAN to our HQ LAN via VPN.
When a particular Windows XP PC is connected to the ASA via a switch, the VPN tunnel drops, and after a short while, all ...
0
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1answer
140 views
Can't update SQL Server 2008 to SP3, it only offers the option to create a new instance
A colleague is attempting to update our server's SQL Server 2008 version 10.0.1600.22 (not R2) install up to SP3. Unfortunately, we can't work out where the "Update" button is; the installer seems to ...
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0answers
121 views
Slow connection to a shared .mdb file over a LAN on some machines only (SOLVED)
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 ...
1
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3answers
89 views
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 ...
0
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1answer
94 views
How to check http errors with Windows 2008 Server?
This is the best I can describe my problem...
I am running a search engine scraper essentially on Windows 2008 Server. Constantly accessing millions of random domain names and following their links ...
0
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2answers
92 views
how do I troubleshoot rdp
I have one Windows XP SP3 pc on the domain that I cannot rdp into.
The xp pc is enabled for rdp sessions.
Port 3389 is open in the firewall.
There are no errors in the event logs.
I have tried to rdp ...
2
votes
1answer
47 views
When troubleshooting a complex issue is there a reason to go with an additive vs subtractive troubleshooting methodology
TLDR: I am interested in finding out whether there is a reason to select an additive approach to troubleshooting over a subtractive approach, or vice-versa when trying to troubleshoot a problem with ...
0
votes
1answer
70 views
Internal e-mails
We need to send mails from our domain (assume this is example.com) to our self. Now, the 'incoming' mails are handled by another server (from Google). We can send mails through sendmail to external ...
4
votes
2answers
387 views
Putty + Bash + Screen, up arrow for history not working (Ubuntu 11.10)
I have a fresh install of Ubuntu Server 11.10 that I am logging into SSH via PuTTy. When I am inside screen, I cannot use the up arrow to recall bash history (though this works outside of screen). I ...
0
votes
2answers
80 views
How to troubleshoot many failed pageloads?
I've had a few cases in which the homepage of one of my sites wouldn't load in the browser. The site is running on django/fastcgi/nginx.
It was difficult to reproduce so, in an attempt to understand ...
1
vote
1answer
69 views
Troubleshooting potential compromised server from Brute Force SSH Attack [closed]
Possible Duplicate:
My server's been hacked EMERGENCY
So I noticed some files/folders on my webserver and investigating leads the fact that a brute force attack via SSH was done on my ...
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0answers
23 views
Debug squid: when accessing the internet no username is request and user gets blank page
Today we've turned on our pc and we couldn't get on the internet.
Squid simply gave back a white page without login request.
I've cleaned and rebuilt the cache, restarted the server but no luck.
...
0
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1answer
58 views
nginx redirecting for no reason?
This was really annoying and now i see when it happens. If <ip>/NAME exist in /var/www (/var/www/NAME) nginx will give me a redirect to www._.com/NAME/ (note the slash and lack of url) which is ...
0
votes
1answer
199 views
Trying to bridge NIC. What does this error mean?
I would like to bridge between br0 and tap0 for my OpenVPN server, but I get the error at the bottom of this post.
Background
The server have one physical eth0 with IP xxx.xxx.68.58.
The bridge ...
0
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1answer
129 views
Troubleshooting Nagios alerts; aka. Why aren't my alerts firing?
I'm attempting to add email alerts to an existing Nagios install. I've been using the web interface to keep an eye on some non-critical systems for a few months and it's been running well; warnings ...
1
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3answers
66 views
Ubuntu 10.04 install is missing /etc/rc0.d, is there a quickfix?
I have no idea how this happened, but /etc/rc.*/ is simply missing.
As a result, aptitude and apt-get don't work right anymore.
Is there a quick-fix for this? I really don't want to reinstall the OS ...
8
votes
3answers
182 views
Performing root-cause analysis
I want to learn more about how to perform root-cause analysis. More times than not, our department tells the user to try rebooting (thier Windows XP system), which actually "fixes" a good number of ...
0
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0answers
45 views
Why is IIS 6 reverting to asp.net 1.1 from 2.0
We have been having some really strange issues on our web servers recently with the latest being our website applications in IIS6 reverting from asp.net 2.0 to asp.net 1.1 on Windows 2003 server.
The ...
1
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3answers
662 views
SQL Server 2008 CPU usage goes to 100% - troubleshooting help needed?
I have a fairly powerful database server having SQL Server 2008 R2 installed. There is only one database on it which is being accessed from 2 servers (around 5/6 applications). The problem is as soon ...
0
votes
1answer
49 views
Proxy-Connection Header associated with failed connections
I work with microprocessor devices that have/run a micro webserver.
I have two of these devices set up so that they can be accessible to/by the Internet - I'll call the devices "A" and "B".
...
1
vote
1answer
83 views
End-user SSL certificate management workflow
We have an internal website, served from behind HTTPS with client certificates.
Website users are non-technical persons, working remotely. They use Windows (XP, Vista, 7) and OS X (10.5, 10.6, 10.7). ...
0
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3answers
144 views
Ubuntu troubleshooting
I have a computer which keeps becoming unreachable, and a restart fixes the problem. It's under somewhat heavy load (high cpu, and high ram usage), but appears for the most part stable.
What's a good ...
1
vote
2answers
411 views
Server is rebooting unexpectedly, strange kernel messages in log file
I have a server running Ubuntu 10.04 that is rebooting several times a day it seems, and I can't figure out why. It doesn't appear to be a graceful reboot either, because some of the services complain ...
1
vote
2answers
206 views
SSH closes connection when key is accepted
In server's auth.log:
Failed publickey for agladysh from MYIP port 61313 ssh2
In ssh -vvv:
debug1: Offering public key: /Users/agladysh/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a ...
0
votes
1answer
52 views
LAN - troubleshooting
I have 2 clients on my LAN that I'm trying to get to "see" each other. The first as follows
Computer1
IP 172.21.62.230
Subnet 255.255.255.224
Default gateway 172.21.62.225
Preferred DNS server ...
0
votes
2answers
151 views
Troubleshooting firewall and routing on Linux
Are there any tools or API hooks for troubleshooting iptables or routing on Linux? (besides the obvious -j LOG)
In other words: what to do when tables with 200 or 300 firewalling rules after adding a ...
0
votes
1answer
42 views
VMWare Workstation connection problems
Our old setup (which worked):
On workstation W-1 (WinXP - 64bit) we had two virtual machines (VMWare 6.5) V-1 and V-2 (both with WinXP-32).
All of them had a different IP static address, V-1 and ...
0
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0answers
409 views
Juniper ssg 5 web UI not working
I am facing issue with my Juniper SSG 5. I tried to configure & enable web filtering in my office following various ways to do it on the web. Even with various permutations it is still not ...
4
votes
3answers
759 views
Troubleshooting linux server reboots?
I have a Linux server I've just set up, debian squeeze, 2.6.32-5-amd64, and over the past week it's rebooted three times, twice in one day. There was no power outage that I am aware of (and it's ...
2
votes
2answers
107 views
my ssh sessions are randomly killed on Debian
I have a Debian 6.0.1 vanilla install, and I use PUTTY to ssh into it. I will usually have 3 or 4 PUTTY login shells running at the same time.
What I'll find is that if I leave my computer for a ...
