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]