Problem from Comcast Network to The Planet
We have been having a problem emailing to a customer whose server is hosted by The Planet (http://www.theplanet.com/). Our mail server is hosted in-house on a comcast business connection. IP address of our server is: 173.13.45.23 Customers mail server is: 69.93.203.243 I cannot telnet to port 25 on their server, and they cannot telnet to port 25 on ours. If I try to connect to their mail server from a different network such as my home internet connection, I can connect. We do not do any firewalling that would block this in anyway. We were able to send and receive email to them when we used Qwest for our connection, before we switched to Comcast. Comcast has said the problem is not on their end because it times out at The Planet. The Planet doesn't have much interest in speaking with me, because I'm not their customer. Not sure what to do at this point. Below is a traceroute: traceroute to 69.93.203.243 (69.93.203.243), 64 hops max, 52 byte packets 1 223.254.254.75 (223.254.254.75) 2.610 ms 2.057 ms 2.033 ms 2 173-13-45-30-pennsylvania.hfc.comcastbusiness.net (173.13.45.30) 3.656 ms 2.997 ms 3.119 ms 3 * * * 4 68.85.72.129 (68.85.72.129) 10.497 ms 9.624 ms 12.245 ms 5 te-9-1-ur02.greensburg.pa.pitt.comcast.net (68.86.100.53) 9.935 ms 10.049 ms 10.505 ms 6 te-3-2-ar01.mckeesport.pa.pitt.comcast.net (68.86.100.49) 14.795 ms 12.846 ms 14.006 ms 7 te-0-4-0-5-cr01.mclean.va.ibone.comcast.net (68.86.91.129) 17.868 ms 16.278 ms 21.110 ms 8 pos-1-10-0-0-cr01.atlanta.ga.ibone.comcast.net (68.86.86.126) 43.022 ms 40.690 ms 39.818 ms 9 pos-1-15-0-0-cr01.dallas.tx.ibone.comcast.net (68.86.85.149) 58.980 ms 58.914 ms 59.673 ms 10 pos-0-0-0-0-pe01.1950stemmons.tx.ibone.comcast.net (68.86.86.90) 59.608 ms 60.322 ms 59.691 ms 11 theplanet-cr01.dallas.tx.ibone.comcast.net (75.149.228.2) 62.246 ms 61.320 ms 61.693 ms 12 te3-5.dsr01.dllstx3.theplanet.com (70.87.253.86) 61.431 ms te7-1.dsr02.dllstx3.theplanet.com (70.87.253.18) 58.859 ms 59.365 ms 13 76.fd.5746.static.theplanet.com (70.87.253.118) 62.690 ms te1-3.dsr02.dllstx2.theplanet.com (70.87.253.122) 68.123 ms te3-3.dsr02.dllstx2.theplanet.com (70.87.253.126) 59.382 ms 14 po1.car02.dllstx2.theplanet.com (70.87.254.82) 59.321 ms 60.268 ms 66.206 ms 15 * * * 16 * * * 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 * * * 26 * * * 27 * * * 28 * * * 29 * * * 30 * * * 31 * * * 32 * * * 33 * * * 34 * * * 35 * *^C
On 3/5/10 1:33 PM, Zachary Frederick wrote:
We have been having a problem emailing to a customer whose server is hosted by The Planet (http://www.theplanet.com/). Our mail server is hosted in-house on a comcast business connection.
IP address of our server is: 173.13.45.23
Customers mail server is: 69.93.203.243
I cannot telnet to port 25 on their server, and they cannot telnet to port 25 on ours.
If I try to connect to their mail server from a different network such as my home internet connection, I can connect. We do not do any firewalling that would block this in anyway. We were able to send and receive email to them when we used Qwest for our connection, before we switched to Comcast.
Comcast has said the problem is not on their end because it times out at The Planet. The Planet doesn't have much interest in speaking with me, because I'm not their customer.
Have the recipient who is a The Planet customer open a case with them. For what it's worth (not much, I know), it works from here. Mail server is likely behind a PIX with SMTP fixup enabled. ~ jay$ telnet 69.93.203.243 25 Trying 69.93.203.243... Connected to mx.insurancewebsitebuilder.com. Escape character is '^]'. 220 ******************************************************************************************** -- Jay Hennigan - CCIE #7880 - Network Engineering - jay@impulse.net Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV
On Mar 5, 2010, at 4:33 PM, Zachary Frederick wrote:
We have been having a problem emailing to a customer whose server is hosted by The Planet (http://www.theplanet.com/). Our mail server is hosted in-house on a comcast business connection.
IP address of our server is: 173.13.45.23
Customers mail server is: 69.93.203.243
I cannot telnet to port 25 on their server, and they cannot telnet to port 25 on ours.
If I try to connect to their mail server from a different network such as my home internet connection, I can connect. We do not do any firewalling that would block this in anyway. We were able to send and receive email to them when we used Qwest for our connection, before we switched to Comcast.
Comcast has said the problem is not on their end because it times out at The Planet. The Planet doesn't have much interest in speaking with me, because I'm not their customer.
Not sure what to do at this point.
Below is a traceroute:
If you have a suitable platform, try tcptraceroute and see where port 25 is blocked.
On Mar 5, 2010, at 3:33 PM, Zachary Frederick wrote:
We have been having a problem emailing to a customer whose server is hosted by The Planet (http://www.theplanet.com/). Our mail server is hosted in-house on a comcast business connection.
I don't know what's going on in the Comcast network, but I've been having similar fits with a single IP address in my network. Comcast can get to nearby IP addresses in the same /24 no issue. The Comcast customer in my case is in Florida, and I get to them via TWTelecom. I know it's not my net, and TWT was very helpful and knows it's not their net. Attempts to get Comcast to look into it seem to end with them pinging their customer's IP address from the Comcast support center and terminating the call "since they can reach them." --Chris
On Fri, Mar 5, 2010 at 1:33 PM, Zachary Frederick <zcfrederick@gmail.com> wrote:
We have been having a problem emailing to a customer whose server is hosted by The Planet (http://www.theplanet.com/). Our mail server is hosted in-house on a comcast business connection.
IP address of our server is: 173.13.45.23
Customers mail server is: 69.93.203.243
I cannot telnet to port 25 on their server, and they cannot telnet to port 25 on ours.
If I try to connect to their mail server from a different network such as my home internet connection, I can connect. We do not do any firewalling that would block this in anyway. We were able to send and receive email to them when we used Qwest for our connection, before we switched to Comcast.
Comcast has said the problem is not on their end because it times out at The Planet. The Planet doesn't have much interest in speaking with me, because I'm not their customer.
Not sure what to do at this point.
Can you hit the submission port? (587) -Bryan
On Mar 5, 2010, at 1:33 PM, Zachary Frederick wrote:
We have been having a problem emailing to a customer whose server is hosted by The Planet (http://www.theplanet.com/). Our mail server is hosted in-house on a comcast business connection.
IP address of our server is: 173.13.45.23
Customers mail server is: 69.93.203.243
I can get there from Comcast Business [chort@abydos ~]$ nc 69.93.203.243 25 220 ******************************************************************************************** ehlo smtps.net 250-securemail.insurancewebsitebuilder.com Hello smtps.net [173.11.102.7], pleased to meet you. 250-ENHANCEDSTATUSCODES 250-SIZE 250-XXXA 250-ETRN 250-XXXB 250-DSN 250-CHECKPOINT 250-8BITMIME 250-AUTH CRAM-MD5 PLAIN LOGIN DIGEST-MD5 250-XXXXXXXC 250 XXXD quit 221 2.0.0 securemail.insurancewebsitebuilder.com closing connection That's almost certainly a PIX/ASA with fixup enabled (like Jay said). It's been known to cause many interoperability problems. The solution is pretty simple: no fixup protocol smtp 25 -- bk
participants (6)
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Brian Keefer -
Bryan Irvine -
Chris Boyd -
Jay Hennigan -
Steven Bellovin -
Zachary Frederick