RE: [courier-users] Re: Thunderbird - courier-IMAP interaction problems

courier-users-admin@lists.sourceforge.net wrote:
> Sam Varshavchik wrote:
>> Peter Ford writes:
>>
>>> The problem is that half the company is on another site and connects
>>> through their ADSL router which masquerades the IP address.
>>> MAXDAEMONS=4000 is a bit over the top, I admit, but MAXPERIP needs
>>> to be big enough to potentially let the whole company come in on
>>> one IP - we might have a company meeting there...
>>>
>>> Troels' post, and the link within to Mozilla's bugzilla, suggests
>>> there is a known problem with IMAP servers timing the connection out
>>> in under 29 minutes, which T-bird doesn't like. If there's an easy
>>> config to
>>
>>
>> The problem is that "ADSL router". It's broken.
>>
>>> change the timeout in Courier-IMAP then I might use that, otherwise
>>> I'll recommend waiting for a new release.
>>
>>
>> Courier does not timeout sessions in less then 30 minutes. Courier
>> users the standard 30 minute timeout.
>>
>> Your problem is a common one involving broken "routers" that break
>> connections if they don't see any activity on the connection for a
>> couple of minutes. It is normal for IMAP sessions to go 15-20
>> minutes without any activity. A broken router then convinces itself
>> that the connection no longer exists, and breaks it.
>>
>>
> That's an intersting thought - that fits with my observations from
> home (using an ADSL router...)
>
> Hmmm....
> I'll look into that a bit more.

If these two offices interact a lot, it might make sense to look into
using a VPN tunnel. Besides the security, the VPN devices will abstract
all of the hops and retain your original IP. Then, as long as SOME data
is flowing, your ADSL router should keep the connection open.

Our T1 routers have the built-in VPN tunneling, as well as little
Linksys boxes we use on xDSL and cable connections. They seem to work
pretty well, and we have the added security of tunneling everything. It
makes our Wide Area Network much cheaper than the days of frame relay to
everywhere.

That would also fix the MAXPERIP issue you're seeing...




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