Does the Exchange box respond to ping? Also, can you telnet to port 25 to those clients that can't send to you while you're physically on the console of the Exchange box?
S. -----Original Message----- From: Steve Van Eck [mailto:[EMAIL PROTECTED]] Sent: Friday, October 26, 2001 4:10 PM To: Exchange Discussions Subject: RE: smtp problems No, the ISP swears it is wide open. >Any kind of filtering on the router? > >-----Original Message----- >From: Steve Van Eck [mailto:[EMAIL PROTECTED]] >Sent: Friday, October 26, 2001 12:01 PM >To: Exchange Discussions >Subject: smtp problems > > >I have an interesting problem that I hope you can shed some light on. I am >running W2K, SP2 and Exchange 5.5. This box has a IP that sits directly on >our T1, the router is the only thing between it and the ISP. We recently >have been unable to receive email from SOME of our clients. I am unable to >telnet to port 25 on the exchange box from the outside world, I can telnet >to it on our segment. I have a sniffer on the segment and am getting quite >a > >few port unreachable errors. > >Header of packet that caused error follows. >IP Header - Internet Protocol Datagram > Version: 4 > Header Length: 5 (20 bytes) > Type of Service: %00000000 > Precedence: Routine, Normal Delay, Normal Throughput, Normal >Reliability > Total Length: 98 > Identifier: 54627 > Fragmentation Flags: %000 May Fragment Last Fragment > Fragment Offset: 0 (0 bytes) > Time To Live: 128 > Protocol: 17 UDP > Header Checksum: 0x0000 > Source IP Address: 66.xx.xxx.xxx > Dest. IP Address: 207.xxx.xxx.xxx > No IP Options >UDP - User Datagram Protocol > Source Port: 137 NETBIOS Name Service > Destination Port: 137 > Length: 58 > Checksum: 0x0000 >NetBIOS Name Service - Network Basic Input/Output System > Identification: 0x0000 > Parameter: 0x0000 > Request > Standard Query > > >A FreeBSD box on the same network is able to accept the mail, it is listed >as the secondary MX record. Your help is much appreciated. Steve Van Eck > > >_________________________________________________________________ >Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp > > >_________________________________________________________________ >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] > >_________________________________________________________________ >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] _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp _________________________________________________________________ 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] _________________________________________________________________ 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]
