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Accepted
Hrish
Asked: 2012-04-04 06:48:03 +0800 CST

Unable to access the server via SSH?

  • 772

when I am trying to access the server through ssh it says:

ssh: connect to host xx.yyy.zzz.x port 22: Connection refused

and on the server in auth.log it shows following log entry:

Address xx.yyy.zzz.x maps to xx.yyy.zzz.x.static-pune-vsnl.net.in, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!

I have created a user account for that user and it is also in enabled status.

Requested info

  1. It is Ubuntu 11.10
  2. It is configured as SSH Server using openssh-server
  3. I am trying to connect to this server using Putty from Windows 7 i.e. My Desktop
  4. I have also asked this in superuser as per the request of @zpletan and link to that question is given below.

https://superuser.com/questions/408080/unable-to-access-the-server-via-ssh

Thanks in advance.

server ssh log login logging

2 Answers

  1. Best Answer

    The server may enables UseDNS.

    man sshd_config to find information about this.

    If you have the right permission, you can modify /etc/ssh/sshd_config and add UseDNS no to this file.

    • 5

  2. It looks like your ISP has screwed up their DNS records. ssh appears to be complaining because when it looks up the IP address xx.yyy.zzz.x, it gets the name xx.yyy.zzz.x.static-pune-vsnl.net, but that name does not map back to the IP address, which often is an indicator that someone is trying to spoof their hostname. You should complain to your ISP to fix it, or change the setting fossilet mentioned. Such screwed up DNS records will also prevent you from connecting to most IRC servers.

    • 2