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The purpose of this page is to document some of the known causes of the above error, which occurs when logging on to the Process Integration (PI)/Process Orchestration (PO) Enterprise Services Repository (ESR) or Integration Builder tools.


This wiki will show how and where to troubleshoot the above error and also document some of the known causes and solutions to this error.


There are several different causes for this particular error ranging from firewall configurations, to system configuration errors to actual bugs in the software.

Technical Background

Remote Method Invocation (RMI) communication is used in PI for communication between Integration Builder client and the PI server. With SAP J2EE, the internal P4 protocol is used for RMI communication.

Each J2EE instance registers its P4 port with the SAP Message Server. Then, a J2EE client application first connects to SAP Message Server via HTTP to receive a J2EE server instance's P4 port. Using this logon type, a client only needs to know the address and port of the Message Server instead of knowing an individual server address and port.

In PI, the Exchange Profile (or AII Service if you have an AEX) parameters below are used to configure the Message Server host and port values.

How to Reproduce

Depending on your PI release:

  1. In your PI ABAP stack, call transaction sxmb_ifr -> click on the Repository or Directory link.
  2. Open the PI Startpage http://<server>:<port>/dir/start/index.jsp and click on the ESR or Integration Builder Directory link.

If you are using HTTP the error will be similar to: “Cannot connect to server using message server: ms://<server>:<port>/P4”

If you are using HTTPS the error will be similar to “Cannot connect to server using message server: ms://<server>:<port>/P4S”

Common Causes of the Error

  1. Firewall issues - Ensure the required ports are open on your firewall. I cannot document the exact ports here as it will vary depending on your installation type. However the document TCP/IP Ports Used by SAP Applications is a good reference. The P4 port and Message Server port are particularly relevant for accessing the Integration Builder.
  2. Configuration issues - the PI system needs to be correctly configured to function correctly. Many cases of this error are caused because the mandatory Configuration Wizard has not been executed after a new installation, a new upgrade or a System Copy. See SAP Note 1286428 Configuration Wizard: PI Wizard Templates overview. This documents all Configuration Wizards. Ensure the relevant wizard has been executed in your system.
  3. Bugs in the software

Tracing the Error

The traces below are the most useful in troubleshooting this issue. However, it depends on the actual root cause of the issue as to which may be useful/relevant. All should be checked regardless for any errors related to the Integration Builder logon.

  1. the client side java trace as per the attached SAP Note 1891480 How to enable logging in Java WebStart console
  2. the dev_icm trace - see ICM Tracing
  3. the dev_ms trace - see  Message Server Monitor
  4. the defaultTrace from the PI server

Known Issues

  1. BC-XI* Related errors:
    SAP KBA 2416859  PI tools fail to open: Message server not available
    SAP Note 1969736 PI CTC: Message Server settings in NW PI 7.11
    -> SAP Note 1368522 PI CTC: ABAP Message Server Configuration
    SAP KBA 1571274 Cannot connect to server using message server ms://

  2. BC-JAS-COR-RMT Related:
    SAP Note 1843232 P4 duplicate banner error in ICM on host with multiple IPs
    SAP Note 1158626 P4 connection to ICM on machine with multiple IPs fails

  3. BC-CST-MS Related:
    SAP KBA 1911741 PI ESR: Cannot connect to server using message server ms:// P4
    -> SAP Note 1782391 Message server crash

  4. BC-NET Related:
    SAP Note 129997 Hostname and IP address lookup - make sure that IP and hostname resolve correctly
    SAP KBA 2582843 Message server error when opening PI Integration Builder tools

See Also

SAP KBA 2134934 How to properly test the P4 port of an AS Java
SAP KBA 2151862 How to analyse connection issues to the message server

Troubleshooting PI ESR and Integration Builder Logon Issues