Question

SSH connection refused on port 22

Asked by: Lionel35

Hi,
I have a server that i just finished to install on centos 5.3, from time to time (around 5 times during the day) the connection drop and i am not able to connect anymore the timeframe vary from 1 mn to 20 mn i just get ssh: connect to host 10.xx.xx.xx port 22: Connection refused same if i try to telnet, any idea where that might be coming from? As i am not sure where too look, my firewall is disabled SElinux as well sshd is running but still no go.
Thanks!
Lionel

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Asked On
2009-08-12 at 16:55:46ID24648470
Topics

SSH / Telnet Software

,

Linux

,

Linux Setup

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: KeremEPosted on 2009-08-12 at 17:12:17ID: 25084538

Hi,

So you say both your firewall and sshd are disabled. In fact if they were not and running they would even permit you to logon or prevent it. But they won't drop a connection once it is established.

You also say that you see that SSHD is running. did you try to ssh to your localserver fro mthe console?? This would show if the drop was becasue of a network problem or not.

I'll suggest you to check for your:
-  /var/log/messages for any error messages
- "ifconfig" output to see if there are any transmission errors.
- "netstat -anpt | grep :22"  output
- Also try to connect from your local console using "ssh  <IP_ADDR_of_Your_HOST>"  without angle brackets.
- Please try "service network restart" and check if it resumes communication. Some drivers might cause similar problems.
- Will you post your lspci and lshw (if you dont have lshw try to install from here http://dag.wieers.com/rpm/packages/lshw/lshw-2.11-1.el5.rf.x86_64.rpm) outputs?

Cheers,
K.
 

 

by: Lionel35Posted on 2009-08-12 at 19:21:55ID: 25085086

KeremE,
Thanks for the answer, the only thing i can do right now is to run ssh with -vvv and that just give me this

OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 10.xx.xx.xx [10.0.2.93] port 22.
debug1: connect to address 10.xx.xx.xx port 22: Connection refused
ssh: connect to host 10.xx.xx.xx port 22: Connection refused
I do not have the server nearby me right now but I was hopig that the connection will come back, I can telnet without a port number and get 'in' but if i try with 22 it will just plain refuse as soon as the connection is back i will install and post the outputs from the software you mentioned.
Thanks.
Lionel

 

by: Lionel35Posted on 2009-08-12 at 19:34:26ID: 25085121

Actually something very strange when i telnet without the port # i get to a printer !? i put the setting for network on DHCP as i had problem reaching out with a static IP so that could be the problem?

 

by: KeremEPosted on 2009-08-13 at 02:33:51ID: 25086552

Yeah it could be the problem in that if the address has been manually configured with the  IP address, it is possible that CentOS is getting the same address from the DHCP and there's an IP conflict. Thus when detecting the conflict over DHCP assigned address CentOS might be relinquishing the IP in favor of the manually assigned one.

Please check both the printer IP configuration and CentOS logs.

Cheers,
K.

 

by: Lionel35Posted on 2009-08-13 at 06:16:02ID: 25087815

The Ip I got right now on the server is given by DHCP if i try with a manual config it will not be abe to go on the net so i though it was a good idea to go auto

 

by: KeremEPosted on 2009-08-13 at 12:30:50ID: 25091943

Yeah but it seems that your Printer is also getting the same IP. I am not suggesting you to manually set your IP. I am suggesting that you check this issue and modify your IP pool so that it won't overlap with any other fixed IP device. There can be many ways for it:

- You can check your DHCP pool and make sure that all your fixed IP devices are assigned IP address outside the pool.
- You can let your fixed configuration IPs and DHCP pool but exclude these addresses assigned to devices from the poll using eXclude

etc.

Furthermore a statically assigned IP and DHCP assigned IP are the same. If  it is assigned properly it won't prevent you from getting to internet.  You can't go to internet if your Default Gateway and / or IP address mask values are outside your subnet.

Cheers,
K.

 

by: Lionel35Posted on 2009-08-13 at 20:28:44ID: 25095070

KeremE,
Thanks for the answer, I just released the ip and renewed it and all worked fine, also most likely the first Ip I got was probably outside as you pointed out.
Thanks for your help
Lionel

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