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Old 19th January 2011, 05:21
jiandingzhe jiandingzhe is offline
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Default sshd: why my ssh login is weirdly slow?

First of all, I have a server running sshd.
If I login to the server from client running Fedora, using openssh or using nautilus, it will take very long time to have the password prompt displayed. Sometimes it becomes so long that the client cries out a failure.
However, if I login from client running Windows using putty or winscp, it never delays like this.
What might the problem be there? Thanks a lot!
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Old 19th January 2011, 15:48
falko falko is offline
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Any errors in your logs (on the server)? Does the server have correct A and PTR records?
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Old 20th January 2011, 03:30
jiandingzhe jiandingzhe is offline
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Quote:
Originally Posted by falko View Post
Any errors in your logs (on the server)? Does the server have correct A and PTR records?
What is A and PTR record?
Where is sshd's logfile? I'm using Fedora 14.

In /var/log/secure, it seems some malicious guys tried to login with root account frequently. But it still cannot explain why it get slow using ssh, but remain fast using putty.

Last edited by jiandingzhe; 20th January 2011 at 04:13.
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Old 20th January 2011, 19:50
falko falko is offline
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Quote:
Originally Posted by jiandingzhe View Post
What is A and PTR record?
http://en.wikipedia.org/wiki/List_of_DNS_record_types
Quote:
Originally Posted by jiandingzhe View Post
Where is sshd's logfile? I'm using Fedora 14.
Should be somewhere in /var/log/, maybe something like /var/log/auth.log.

Quote:
Originally Posted by jiandingzhe View Post
But it still cannot explain why it get slow using ssh, but remain fast using putty.
It's just a guess, but maybe it has to do something with slow DNS lookups.
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Old 20th January 2011, 20:04
edge edge is offline
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Does it also take a long time to login by FTP from your client's place?
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Old 21st January 2011, 03:02
jiandingzhe jiandingzhe is offline
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Quote:
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Does it also take a long time to login by FTP from your client's place?
I think the FTP service is not opened. Only SFTP.
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Old 21st January 2011, 03:00
jiandingzhe jiandingzhe is offline
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Quote:
Originally Posted by falko View Post
It's just a guess, but maybe it has to do something with slow DNS lookups.
I login to my server by using IP address directly, not by domain name. So I think there's nothing to do with the DNS.
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