On 21/06/12 22:30, Darac Marjal wrote: > On Thu, Jun 21, 2012 at 03:54:28PM +0800, Umarzuki Mochlis wrote: >> I need general help on a multi-server setup with >> >> 2 MTAs (each also a nginx reverse-proxy) >> 2 mailbox servers (round-robin) >> >> when i check nginx.log on both MTA, only the second MTA got https >> connection (zimbra support also confirmed this) and it seems that this >> might caused by DNS setup or related network configuration >> >> how do I pinpoint as to where the root cause might be? > > I think I would first start by checking the output of repeated calls to > "dig +short mx yourdomain.example.org". This should vary, with your > servers swapping positions each time. > > If you only get the same output each time, then it's down to the sending > MTA to pick an appropriate MX from the list. I assume both your MXs have > the same priority; in that case the sending SMTP should pick one at > random and, if that fails, try the other. Note here, that if you're > using round-robin AND same-priority MXs, both are picking the order at > random.
Wait - is this https or SMTP? MX records will only affect SMTP, and the question seemed to relate to https. I got the impression that the fact that the servers also ran MTAs was incidental. Still, the issue will relate to what IP address comes back from a query, and how long it's cached by the client (and intervening name servers). Richard -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4fe3e9d7.20...@walnut.gen.nz
