-----Original Message----- From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of Ralf Hildebrandt Sent: Tuesday, September 25, 2012 9:30 AM To: postfix-users@postfix.org Subject: Re: sporadic bouts of lost connections to exchange 2010 hub transport
* Mikael Bak <m...@inbox.lv>: > Hi Stan, > > On 09/25/2012 08:22 AM, Stan Hoeppner wrote: > > > > Apparently Linux and Windows TCP window scaling doesn't always work > > reliably together. Try disabling TCP window scaling on the Linux box(en): > > > [snip] > > Perhaps off topic, but do you have any links to documents or similar > that proves that there is a problem between the two operationg systems > with regard to TCP window scaling. This is the first time I hear about > this to be honest. I don't know if this is useful, but in our situation the exchange "server" is actually two boxes with both the CAS and Hub Transport roles on them bound together via the software-based windows Network Load Balancer. Since we never had issues relaying to our Exchange 2007 environment (which was based on 2K3 not 2K8), I suspect that the NLB may be the cause. I'm going to disable window scaling on one of our three relays and see if it crops up again on the other two. Thanks, Aaron --- Aaron Bennett Manager of Systems Administration Clark University ITS
