My experience with these so-called "smart" firewalls doing stateful inspection is that they are dumber than they seem! I had a Cisco cable router back in 2003 which was altering PORT/PASV commands' port numbers in FTP. Back then, it was an unknown issue to me and caused lots of frustration...
Good luck, SZ On 1/2/08, Arno Garrels <[EMAIL PROTECTED]> wrote: > > Hi, > > One of my customers reported problems sending mail with an TSmtpCli > application when the Windows firewall is turned on. Strange is that > sending mail data fails for some reason and the server drops the > connection after ~2 minutes (of inactivity) even though port 25 > is explicitely opened. > > First log is with firewall turned off, mail is sent successfully, > second log with firewall turned on and port 25 explicitely opened: > > 01.01.08 2:22:47 PM < MAIL FROM:<[EMAIL PROTECTED]> > 01.01.08 2:22:48 PM > 250 2.1.0 <[EMAIL PROTECTED]>... Sender ok > 01.01.08 2:22:48 PM < RCPT TO:<[EMAIL PROTECTED]> > 01.01.08 2:22:48 PM > 250 2.1.5 <[EMAIL PROTECTED]>... Recipient ok > 01.01.08 2:22:48 PM < DATA > 01.01.08 2:22:48 PM > 354 Enter mail, end with "." on a line by itself > 01.01.08 2:22:48 PM < . > 01.01.08 2:22:48 PM > 250 2.0.0 m01JMoVp009311 Message accepted for > delivery > 01.01.08 2:22:48 PM < QUIT > 01.01.08 2:22:48 PM > 221 2.0.0 ms-smtp-xyz.com closing connection > > > 01.01.08 4:43:40 PM < MAIL FROM:<[EMAIL PROTECTED]> > 01.01.08 4:43:41 PM > 250 2.1.0 <[EMAIL PROTECTED]>... Sender ok > 01.01.08 4:43:41 PM < RCPT TO:<[EMAIL PROTECTED]> > 01.01.08 4:43:41 PM > 250 2.1.5 <[EMAIL PROTECTED]>... Recipient ok > 01.01.08 4:43:41 PM < DATA > 01.01.08 4:43:41 PM > 354 Enter mail, end with "." on a line by itself > 01.01.08 4:45:46 PM < Error=10054 Session aborted! > > Adding the application to the exception list makes no difference. > Anybody any idea? > > -- > Arno Garrels > > -- > To unsubscribe or change your settings for TWSocket mailing list > please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket > Visit our website at http://www.overbyte.be > -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
