On Thu, 9 May 2002, at 6:35pm, Hansen, Eric wrote: > As part of our access statement we used "tcp permit" for 110 and 25. Well > it turned out that by doing this mail came in but didn't go out.
SMTP is TCP port 25. SMTP does not use UDP, not is it an IP-layer protocol. Make sure you have all the rules, and in all directions. Maybe you are accidentally blocking outbound TCP SYN packets on port 25? Also, if your default policy is to drop without reply, make sure you at least send a TCP RST for connect attempts to TCP port 113, which is the "auth" protocol (also called "ident"). Many SMTP mail exchangers will do an "auth" query, and if you just drop those packets on the floor, they may time out or reject you. If all else fails, use a packet sniffer to see what is going over the wire. -- Ben Scott <[EMAIL PROTECTED]> | The opinions expressed in this message are those of the author and do not | | necessarily represent the views or policy of any other person, entity or | | organization. All information is provided without warranty of any kind. | _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
