Email Server Errors

[giganet]

Hello group

Am running Ubuntu 7.10 on my primary Email server with: Postfix With SMTP-AUTH And TLS
Following: http://howtoforge.com/perfect_server_ubuntu7.10

All has worked flawlessly for 8 months...

What I am experiencing is the following errors at random times, this error is being generated on a desktop PC running WIN XP utilizng OE as a Email client.:
Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'mail.giganetwireless.net', Server: 'mail.giganetwireless.net', Protocol: POP3, Port: 110, Secure(SSL): No, Error Number: 0x800CCC0F

I have found that from time to time services such as pop3 and ftp will need to be restarted, I use the MikroTik Dude to watch my network hardware with.

Commands I have to use at times are:
/etc/init.d/courier-pop restart
/etc/init.d/courier-imap restart
/etc/init.d/proftpd restart

These only provide short releif from the errror ocurring again though.
I have also tried to reboot the server but the error still persist.

What would possibly cause this error?

Thanking you in advance for your help...

Regards

[Ben]

What does your own mailserver show in the /var/log/mail.* Files?

[giganet]

Thank you for the reply Ben

Took a look into /var/log.

In mail.err I see the following errors ocurring since the 6th of April:
Apr 8 08:42:48 giganetwireless courierpop3login: Maximum connection limit reached for ::ffff:65.197.209.10
Apr 8 08:43:19 giganetwireless last message repeated 10 times


Thanks for your help

Regards

[falko]

Is 65.197.209.10 your IP address? Or is it maybe a hacker trying to log in again and again? In the latter case you could block that IP address.

[giganet]

Thank you...

The IP 65.197.209.10 is the wireless client back-end appliance which controls AAA, IPS, etc, for my WISP system.

This is the address which all users will appear to be coming from when they do anything Online.

This appliance will only utilize the Email server when it is alerting the admin of issues or when the admin chooses to Email the clients at any time required.


Regards

[falko]

Not sure if there's a connection limit somewhere in the Courier configuration. Did you check Courier's configuration files?

[giganet]

Thank you Falko

I am unsure of which file actually is the courier config file?

I have been looking in the file "pop3d" located in the dir '/etc/courier' and have located the following setting
which I have question of whether I should try allowing MAXPERIP=20
MAXPERIP=4
For the last couple of days I must restart pop3 every hour or two...

Or is there another file I should be looking in to alter settings through?

Thanks allot Falko

Regards

[falko]

Thank you Falko

I am unsure of which file actually is the courier config file?I think you should check all config files in the /etc/courier directory.

I have been looking in the file "pop3d" located in the dir '/etc/courier' and have located the following setting
which I have question of whether I should try allowing MAXPERIP=20
MAXPERIP=4


I'd try it to see if it makes a change.