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SYN Timeout on outgoing SMTP connection

I've configured my ASA5505 to allow SMTP out from and into the network. However, when I do a telnet test on port 25 to my relay server, it fails with the following (log traces):

7|Sep 04 2009|12:22:20|609002|62.69.62.120||||Teardown local-host outside:62.69.62.120 duration 0:00:30

6|Sep 04 2009|12:22:20|302014|62.69.62.120|25|10.0.0.1|11133|Teardown TCP connection 1716642 for outside:62.69.62.120/25 to inside:10.0.0.1/11133 duration 0:00:30 bytes 0 SYN Timeout

6|Sep 04 2009|12:21:50|302013|62.69.62.120|25|10.0.0.1|11133|Built outbound TCP connection 1716642 for outside:62.69.62.120/25 (62.69.62.120/25) to inside:10.0.0.1/11133 (94.30.68.82/1164)

7|Sep 04 2009|12:21:50|609001|62.69.62.120||||Built local-host outside:62.69.62.120

6|Sep 04 2009|12:21:50|106100|10.0.0.1|11133|62.69.62.120|25|access-list inside_access_in permitted tcp inside/10.0.0.1(11133) -> outside/62.69.62.120(25) hit-cnt 1 first hit [0xa0c1d109, 0x0]

7|Sep 04 2009|12:21:46|609002|62.69.62.120||||Teardown local-host outside:62.69.62.120 duration 0:00:03

6|Sep 04 2009|12:21:46|302021|62.69.62.120|0|10.0.0.1|512|Teardown ICMP connection for faddr 62.69.62.120/0 gaddr 94.30.68.82/15949 laddr 10.0.0.1/512

6|Sep 04 2009|12:21:43|302020|10.0.0.1|512|62.69.62.120|0|Built outbound ICMP connection for faddr 62.69.62.120/0 gaddr 94.30.68.82/15949 laddr 10.0.0.1/512

7|Sep 04 2009|12:21:43|609001|62.69.62.120||||Built local-host outside:62.69.62.120

6|Sep 04 2009|12:21:43|106100|10.0.0.1|8|62.69.62.120|0|access-list inside_access_in permitted icmp inside/10.0.0.1(8) -> outside/62.69.62.120(0) hit-cnt 1 first hit [0x76bccdc9, 0x0]

I know that this relay server is accessible from other networks with ASAs at the edge. Is there a config error somewhere?

BTW, incoming SMTP works totally fine.

1 REPLY
New Member

Re: SYN Timeout on outgoing SMTP connection

resolved: ISP was blocking SMTP...

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