Re: [fetchmail-users] strange polling errors

[Jerry <fet...@se...>]

On Mon, 28 Feb 2011 15:39:56 +0100
Matthias Andree <mat...@gm...> articulated:

> Am 28.02.2011 15:25, schrieb Jonathan Buschmann:
> 
> > At precisely 28/02/2011 15.01, with renowned erudition Matthias
> > Andree eloquently scribed:
> 
> >> Possible reasons include:
> 
> ...
> 
> >> - the Exchange server closing the connection after 5 minutes of
> >> idle time when it should allow 30 minutes.  I've never operated an
> >> Exchange server and know nothing about configuration options.

Per RFC-2177

<quote>
   The server MAY consider a client inactive if it has an IDLE command
   running, and if such a server has an inactivity timeout it MAY log
   the client off implicitly at the end of its timeout period.  Because
   of that, clients using IDLE are advised to terminate the IDLE and
   re-issue it at least every 29 minutes to avoid being logged off.
   This still allows a client to receive immediate mailbox updates even
   though it need only "poll" at half hour intervals.
</quote>

> > Likely. strange that no one else has seen it, if it's this. Unless
> > it's something configurable on Exchange.
> 
> Possibly other clients reconnect silently. Fetchmail doesn't do that.

According to the info on
"http://technet.microsoft.com/en-us/library/ff459598.aspx", the default
setting is 30 minutes for the 2010 version. I have not been able to
confirm it, however, it appears that the older 2007 version defaults to
20 minutes. Now, if the version is <=2005, then all bets are off.

If the OP could post the version and possible the output of making a
connection to the Exchange server, a better guess could be made as to
where the problem lays.

I have confirmed that the settings are configurable on the Exchange
server. Of course, the user has to know what version he/she is going to
configure.

-- 
Jerry ✌
Fet...@se...

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