Can't utilize Exchange 2007 receive connector from another Windows server

Posted on 2009-04-15
Last Modified: 2012-05-06
Hi, we are running Exchange 2007 SP1 and having a problem with the receive connector.  We'd like to be able to permit relaying through the Exchange server IP for any system on the network.  I have set up the receive connector and configured it to use port 25, to allow all network ranges to connect, and experimented with various authentication and permission groups settings.  Unfortunately, I cannot use this receive connector from 2 other Windows 2003 servers - I get an error when trying that the connection is refused, and I cannot telnet to port 25 on the Exchange server IP.  I have set up a separate receive connector utilizing port 587, tried all permutations of authentication settings (basic, Windows integrated, etc.) and tried all combinations of permission groups settings, specifically making sure Anonymous users CAN connect.  No progress on this.

What's interesting is that I CAN telnet to port 25 on the Exchange server from my Windows XP workstation.  I can telnet to the separate receive connector as well.  So, it seems like the receive connectors are working OK, but the Windows servers just can't talk to them.  I have checked firewall settings (no firewalls on any of these systems), security event logs, Receive Connector logs, but don't seem to be able to find the cause of this.  Restarted the Transport service many times as well.

Anyone have any ideas on why a Windows 2003 server can't use the receive connector but a Windows XP workstation can?  My only theory is that it has something to do with the XP workstation being a MAPI client with Outlook, etc. and it is somehow being seen as a trusted connection, whereas the Windows 2003 servers are being rejected.

Thanks in advance for any assistance anyone can provide-

Question by:jonathanchapman
    LVL 7

    Assisted Solution

    Check for windows firewall on windows 2003 machine.

    ALso,here ur main concern is telnet or allowing relaying for the entire network??
    LVL 6

    Accepted Solution

    Try this, it should resolve your issue, as far as relay is concern...
    LVL 6

    Expert Comment

    any update...

    Author Comment

    Sorry for the delay, guys - doing some further testing.  It turns out this was not an Exchange 2007 problem at all  but rather the antivirus program that was running on the servers - it had a setting to block bulk email transmissions to prohibit worm activity; this setting was preventing the servers from transmitting legitimate mail to the receive connector on the Exchange server.  I'll accept multiple solutions here since your answers were correct (and both related to how this was solved) - thanks!!

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Why You Should Analyze Threat Actor TTPs

    After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

    Find out how to use Active Directory data for email signature management in Microsoft Exchange and Office 365.
    Not sure what the best email signature size is? Are you worried about email signature image size? Follow this best practice guide.
    In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Mail Flow…
    To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…

    759 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    8 Experts available now in Live!

    Get 1:1 Help Now