Reinstallation SAP ABAP Netweaver issue message server not connected

hi ,
i am trying to reinstall SAP ABAP Netweaver but getting error in step 24 of 27. i am getting the following error.
WARNING 2010-07-20 08:52:08.078 iaxxcmsclient.cpp:93
CIaMsgClient::CIaMsgClient(localhost, 3900)
Connect to message server (localhost/3900) failed: NIECONN_REFUSED.
INFO 2010-07-20 08:52:08.078
CJSlibModule::writeInfo_impl()
State of instance NSP/DVEBMGS00 changed from ABAP: UNKNOWN to ABAP: UNKNOWN.
WARNING 2010-07-20 08:52:37.171 iaxxcmsclient.cpp:93
CIaMsgClient::CIaMsgClient(localhost, 3900)
Connect to message server (localhost/3900) failed: NIECONN_REFUSED.
WARNING 2010-07-20 08:53:07.156 iaxxcmsclient.cpp:93
CIaMsgClient::CIaMsgClient(localhost, 3900)
Connect to message server (localhost/3900) failed: NIECONN_REFUSED.
WARNING 2010-07-20 08:53:36.125 iaxxcmsclient.cpp:93
CIaMsgClient::CIaMsgClient(localhost, 3900)
Connect to message server (localhost/3900) failed: NIECONN_REFUSED.
Please do tell me how to resolve this issue.
thanks,
tanmaya

Hi Tanmaya,
Question: How to find whether the port is blocked or not?
(A) You can check the message server port in txn SMMS or dev_ms trace in ST11 to verify if the port is correctly set. If it is and you cannot connect to the message server then you will need to find out which program/service is occupying port 3900. So please follow the steps below:-
(A1) On Unix there is a program called LSOF available which shows ALL programs that occupies all ports. SAP Note [164937|http://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes/sdn_oss_bc_cst/~form/handler%7b5f4150503d3030323030363832353030303030303031393732265f4556454e543d444953504c4159265f4e4e554d3d313634393337%7d] shows were you can get this program.
(A2) On Windows the equilivent of LSOF is Process Explorer from the Sysinternals Suite. This is available on the MS website [here|http://technet.microsoft.com/en-us/sysinternals/bb842062.aspx]. You can use this to filter by port.
So using these programs you will be able to see which programs occupy all ports on your server and either remove or disable them.
P.S. You can use SAP Note [421359|http://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes/sdn_oss_bc_cst/~form/handler%7b5f4150503d3030323030363832353030303030303031393732265f4556454e543d444953504c4159265f4e4e554d3d343231333539%7d] to bind any port to any service on Unix including "protected" ports !!!
Hope this helps
Michael

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