Connect. Communicate. Collaborate. Securely.

Home » Kerio User Forums » Kerio Control » Can't get internet based email working through firewall

Messages: 2
Karma: 0
Send a private message to this user
Setup is windows 2000 server sp4 with dual lan cards
Running Winroute Firewall 6.2.0 build 1323(30 day trial)
first lan card is cable connection to internet 203.97.xx.xx
second lan card is connected to Gigabit switch
clients are all in 192.168.0.x subnet
Mail server is internet based
Have got traffic rules set for pop&smtp access
Mail client is Outlook express 6
When checking email on any Lan pc gets the first message from the mail server then gives this error.
"Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: '', Server: '', Protocol: POP3, Server Response: '+OK 26147 octets', Port: 110, Secure(SSL): No, Error Number: 0x800CCC0F"

Any help would be appreciated.

Messages: 4
Karma: 0
Send a private message to this user =d8dc9302c7fcdb6890d8cfab753d1858&srch=drtcp#msg_33521

As Kerio_pedobry states in his post, try lowering your MTU settings on all workstations.

Good luck, hope this helps.
Petr Dobry (Kerio)

Messages: 782
Karma: 61
Send a private message to this user
In this case is probably problem with POP3 protocol inspector. Try to disable POP3 inspector in Configuration->Definitions->Services->POP3->Add(Edit) set Protokol inspection to none. This may help you. But note, this will disable antvivirus checking of POP3 protocol.

Petr Dobry
Product Development Manager | Kerio

Messages: 2
Karma: 0
Send a private message to this user
Thanks for the help guys it was my mistake i had turned the protocol inspector off for only one of the 2 rules i was using once i realised and turned it off for both rules it worked fine. Very unusual result considering it is just standard pop3 traffic that i would assume should pass the inspector.

Thanks for the suggestion but for the work around i had used windows internet connection sharing which worked fine so i never could see any reason in changing the mtu value when the system worked fine with other software.
Previous Topic: Use external Virusscanner
Next Topic: Bad request on Firewall host
Goto Forum:

Kerio discussion forums are intended for open communication between forum members and may contain information and material posted by members which may be useful in learning about Kerio products. The discussion forums are not intended to provide technical support for any specific product. Any information implied or expressed in the discussion forums is that of the posting member. Kerio is in no way responsible for the information posted in the forums, or its accuracy. Kerio employees may participate in the discussions, but their postings do not represent an offical position of the company on any issues raised or discussed. Kerio reserves the right to monitor and maintain the forums to promote free and accurate exchange of information.

Current Time: Sun Nov 19 19:10:34 CET 2017

Total time taken to generate the page: 0.00619 seconds
.:: Contact :: Home ::.
Powered by: FUDforum 3.0.4.