Very slow POP3 server

[kamalito]

Hi
Since a couple of days, I have very slow transfer rates with the POP3 server of my debian lenny 5. The SMTP server seems fine.
Any idea on the origin of the problem?
Regards

[Ben]

How do you notice that the POP3 is slow? By any calculated transfer speed on a specific client? Or do you see the problem on other clients as well?

[kamalito]

By checking transfer rates from different computers in the office (Outlook & Thunderbird). For example, it took more than 5 seconds to download a very short, text only, mail.

[falko]

Are there any errors in your mail log (in the /var/log/ directory)?

[Ben]

Originally Posted by kamalito

By checking transfer rates from different computers in the office (Outlook & Thunderbird). For example, it took more than 5 seconds to download a very short, text only, mail.

But the clients use all the same internet connection / provider to the server or are they connected to the server via LAN?

You could also check the messages log for any drops on the local firewall, if active, or check with tcpdump or similar if you have any retransmissions etc.

[kamalito]

Hi Falko and Ben
The clients use all the same connection. But for the same client and on my computer, I have different accounts for different providers and the problem is only with my ispconfig 3 server.

Some days ago, I had the following warn messages in /var/log/mail.warn :

Sep 8 12:58:18 ns2095972 authdaemond: failed to connect to mysql server (server=localhost, userid=ispconfig): Too many connections
Sep 8 12:58:18 ns2095972 pop3d: authentication error: Input/output error
Sep 8 12:58:45 ns2095972 authdaemond: failed to connect to mysql server (server=localhost, userid=ispconfig): Too many connections
Sep 8 12:58:45 ns2095972 imapd: authentication error: Input/output error
Sep 8 12:59:47 ns2095972 postfix/proxymap[24165]: warning: connect to mysql server 127.0.0.1: Too many connections
Sep 8 12:59:47 ns2095972 postfix/proxymap[24165]: warning: connect to mysql server 127.0.0.1: Too many connections
Sep 8 12:59:47 ns2095972 postfix/trivial-rewrite[24168]: fatal: proxy:mysql:/etc/postfix/mysql-virtual_domains.cf(0,lock|fold_fix): table lookup problem
Sep 8 12:59:48 ns2095972 postfix/master[10686]: warning: process /usr/lib/postfix/trivial-rewrite pid 24168 exit status 1
Sep 8 12:59:49 ns2095972 postfix/trivial-rewrite[24171]: fatal: proxy:mysql:/etc/postfix/mysql-virtual_domains.cf(0,lock|fold_fix): table lookup problem
Sep 8 12:59:50 ns2095972 postfix/smtpd[24164]: warning: problem talking to service rewrite: Success
Sep 8 12:59:50 ns2095972 postfix/master[10686]: warning: process /usr/lib/postfix/trivial-rewrite pid 24171 exit status 1
Sep 8 12:59:50 ns2095972 postfix/master[10686]: warning: /usr/lib/postfix/trivial-rewrite: bad command startup -- throttling

Do you think the problem is related to mysql-virtual_domains.cf ?
Regards

[till]

Originally Posted by kamalito

Do you think the problem is related to mysql-virtual_domains.cf ?
Regards

I dont think so, but this other problem should be fixed too. The reason for the problem is that the connection limit in mysql is too low. See here for the fix:

http://www.howtoforge.com/forums/sho...90&postcount=2

[kamalito]

Originally Posted by till

I dont think so, but this other problem should be fixed too. The reason for the problem is that the connection limit in mysql is too low. See here for the fix:

http://www.howtoforge.com/forums/sho...90&postcount=2

Hi Till
That's what I did when I noticed those warnings.