On Fri, Jun 06, 2003 at 03:42:57PM -0500, Michael Lambert wrote: > We've been experiencing a strange problem that is baffling our mail and > network gurus. Our listserv server is hosted on a linux/390 RH 7.2 > image. Aside from some hiccups when the server was first built, listserv > has just worked. Recently, however, I moved the listserv image from the > RH 2.4.9-38 kernel to 2.4.19 with the IBM patches applied and moved from > IUCV connections to a guestlan architecture. > > We immediately began seeing undelivered mail to a few specific sites > pile up in the mqueue. Most of the listserv traffic was being delivered > but a few sites returned connection refused or connection timed out. > These sites, incidentally, also feature higher security then the others.
What do you mean by "higher security"? What hosts do recieve messages? What hosts don't? > The DNS servers at our site and at the recipient's sites both had the > correct info, so it doesn't appear to be a lookup issue. Sending mail > manually from the command line (and telnetting to 25) also elicited the > same responses. We moved listserv back to the IUCV connection and > original ip but the behavior remained the same. > > In the course of testing, we found that some RH 9 boxes that we have > also refuse to take any mail from the server. A quick glance at the logs > and sniff of the traffic shows that the connection is rejected before > any mail negotiation takes place, as if the packets are malformed or > unacceptable in some way. We can traceroute and ping successfully, > however. Can you use any other tcp services? e.g: a simple http server? > > Does this ring any bells for anyone? I would backlevel the server to > 2.4.9-38 (although I'm not convinced that the kernel is the problem), > but I can't seem to find the rpm any longer. Is there any issue of IP address change and relay? Some hosts expect that mail should come only from specific IPs? -- Tzafrir Cohen +---------------------------+ http://www.technion.ac.il/~tzafrir/ |vim is a mutt's best friend| mailto:[EMAIL PROTECTED] +---------------------------+
