Home > BizTalk Exception-Cause-Resolutions > The POP3 adapter could not establish a connection with the POP3 server

The POP3 adapter could not establish a connection with the POP3 server

Exception :

The adapter “POP3” raised an error message. Details “The POP3 adapter could not establish a connection with the POP3 server. This could be due to the following reasons:
1) The POP3 server host and port information is incorrect.
2) The POP3 server is not running or is not reachable due to network issues.
URL: POP3://<server name>#<user name>
Error: No connection could be made because the target machine actively refused it “.

Cause :

This exception occurs when your firewall blocks the ports used by BizTalk Server to connect to the POP3 server.

Resolution :

There are certain ports that has to be opened on the firewall to allow BizTalk to communicate with the POP3 server.The list of ports to be opened on the firewall  for each adapter can be found at the following link:  http://msdn.microsoft.com/en-us/library/dd802759(v=bts.10).aspx

Remember to mention the port number as 995 if a Secure connection is used.

To know more about other POP3 Adapter Configurations check

http://msdn.microsoft.com/en-us/library/aa559245(v=bts.70).aspx

Please post any of your comments or questions.

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