connection timeout while relaying to Bell Canada clients

Need help? Ask here.

Moderator: Moderators

Post Reply
jaytee50
Posts: 3
Joined: Tue May 03, 2005 8:27 pm

connection timeout while relaying to Bell Canada clients

Post by jaytee50 »

no mail is going thru to 2 of my clients that are both on the bell network.

outgoing rollernet logs show:

conversation with 70.X.X.X[70.X.X.X] timed out while performing the EHLO handshake

each client has restarted the servers (sbs2008), modems, and routers.

telnetting to the port works fine.
smtp test tools say 'fine'

has anyone else seen this issue with Bell?
Seth
Site Admin
Posts: 309
Joined: Sun Aug 30, 2009 10:44 pm
Location: Nevada
Contact:

Post by Seth »

I already answer this via email, but jut to follow up in case this happens to anyone else:

The problem was that Exchange is advertising that it supports TLS connections (with the STARTTLS capability string), however it appears to be broken on the client side. Retrying with an unencrypted (non-TLS) connection was successful, however if the Exchange server's TLS is not working it should be disabled.

Roller Network has supported opportunistic TLS connections on all of our mail services since early 2006. This function is controlled by the capability strings in the SMTP session, specifically STARTTLS. If it is advertised to us when we make an outgoing connection a TLS connection will be initiated. Likewise, we advertise STARTTLS to all incoming connections.
Seth Mattinen, Roller Network LLC
jaytee50
Posts: 3
Joined: Tue May 03, 2005 8:27 pm

SBS2008 suddenly had broken TLS mechanism.

Post by jaytee50 »

It was the exchange smtp SSL/TLS that would just hang.
SBS2008 suddenly had broken TLS mechanism.

On one server the problem resolved itself, on the other i had to remove TLS authentication.

Problem solved.
Post Reply