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New Member

Duplicate TCP SYN from inside ??

Hello all,

A user can not send e-mail using outlook, but he can retrieve his email.

I checked the ASA 5505 log and I found a message:

4 Oct 15 2009 09:07:18 419002 192.168.106.2 209.210.**.1*0 Duplicate TCP SYN from inside:192.168.106.2/1323 to outside:209.210.**.1*0/25 with different initial sequence number

192.168.106.2 is his computer ip address and 209.210.**.1*0 is the smtp server.

Does the ASA 5505 block the connection to the SMTP server? Please help!

Thank you.

1 REPLY
New Member

Re: Duplicate TCP SYN from inside ??

Verizon, the Internet Services Provider, had changed the SMTP port from 25 to 578. Reconfigure MS Outlook SMTP port to 578 and the problem is gone.

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