SSO to SAP via SAP Logon Group

Hi,
I've tried to configure SSO to SAP via SAP logon group. When trying this I'll get the following error:
Connect to message server failed Connect_PM MSHOST=<server>, R3NAME=IB1, GROUP=IB1_Web LOCATION CPIC (TCP/IP) on local host ERROR The message received isn't from a message server. Are you really connected to the message server? Please check your connection parameters. (<server> / sapmsIB1) TIME Tue Dec 16 16:48:49 2008 RELEASE 640 COMPONENT MS (message handling interface, multithreaded) VERSION 4 RC -2
I've also configured the file services under winnt\system32\drivers\etc on the BO server with the following line:
+sapmsIB1      443/tcp     +
Is there anything I'll have to configure too? Or what does this error mean? The server which I have tried to reach is a message server.
Thanks in advice.
Claudia

HI Ingo,
yes I can connect with SAP GUI via message server and application server. I can also connect with BO via sso to the application server. Only the message server failed.
I have now found out that I had the wrong port. But also the right port doesn't work. I have tested the port with telnet. The port is reachable.
Thanks
Claudia

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