Microsoft Exchange Transport Service stuck on start

Hi
Since I create a receive connector on Microsoft Exchange 2013 so another computer relay email to the exchange server I keep having problems with the Transport services that get stuck on starting. As soon as I disable that connector the service start and if I enable it back it still work until the server get reboot it.
This is what I see on the event Viewer:

Inbound direct trust authentication failed for certificate %1. The source IP address of the server that tried to authenticate to Microsoft Exchange is [%2]. Make sure EdgeSync is running properly.

The address is already in use. Binding: 0.0.0.0:25.

Failed to start listening (Error: 10048). Binding: 0.0.0.0:25.
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infedonetworkAsked:
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StuartTechnical Architect - CloudCommented:
It sounds like the connector is in conflict because it is listening on the same IP and port, try changing the receive connector you created to a non standard port eg 2525 or adding an additional IP to your network interface and configuring the receive connector to listen on that IP

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infedonetworkAuthor Commented:
Thank you for the info.
I did change the port to 2525 and restart the transport services and looks like it did start fine.
I will monitor to see if the relay work now
Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Generally speaking, you should use the Front end transport when creating receive connectors.

Here's an explanation of how the transports working Exchange 2013.
http://blogs.technet.com/b/rischwen/archive/2013/03/13/exchange-2013-mail-flow-demystified-hopefully.aspx
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