On 10/18/2014 07:01 AM, jason hirsh wrote: > I have about 8 of these over two days all continue to be retired > > I am trying to be pro-active and was just looking if ether was something i > may have hosed on my side > > although this is the only server I have been having problems > > I really think the issue is with that server but was just looking for expert > input
What happens when you use TELNET to connect to the remote server on port 25? Perform the test repeatedly from your mail server -- that will help you with clue. For example, if it takes a long time for TELNET to connect, then you know the remote server may be overloaded. I discovered with, a TACACS daemon with a too-short backlog, that the IP stack in the server will complete the three-part handshake -- then finds it can't pass the connection to the LISTEN socket because the backlog is full. After the various TCP wait times expire, the stack sends RST and forgets the connection. The key for making me think this is the scenario is the clause "while receiving the initial servergreeting" in the log message. The remote SMTP server may never have had the connection passed on to it because of high backlog overflow on the remote host. One reason the remote operator doesn't see a problem is because s/he never knows this is happening (no logging of the event) and no other mail server operator has complained to him about this. I know I would ignore the message when I see it. Are you getting bounce messages on mail being sent to this server? Are you seeing this happen again and again on the same queued message, or it is happening with different queued mail?
