TCP connections are not possible to the specified server

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I'm trying to add an additional application server instance to a HA PI 7.1 system.

During the installation, I get the error:

TCP connections are not possible to the specified server.
SOLUTION: Check that the tcp protocol is enabled on the server and there are no conflicts on binding ports (you can see it in the server error log).

No messages are being raised with the Windows system logs.

I have tried restarting the server and resuming the installation, but this did not help.

Here is the relevant part of the SAP log:

TRACE 2012-04-13 11:29:57.374 [iaxxgenimp.cpp:1241] CGuiEngineImp::acceptAnswerForBlockingRequest Waiting for an answer from GUI
TRACE 2012-04-13 11:42:19.44 [iaxxdlghnd.cpp:198] CDialogHandler::doHandleDoc() ACTION_OK received
TRACE 2012-04-13 11:42:19.059 NWDBmss.getDBInstanceName()
TRACE 2012-04-13 11:42:19.059 NW.getPersistentDefaultProfile()
TRACE 2012-04-13 11:42:19.106 NW.isUnicode(true)
TRACE 2012-04-13 11:42:19.106 NW.isUnicode() done: true
TRACE 2012-04-13 11:42:19.106 NW.getPersistentDefaultProfile() done
TRACE 2012-04-13 11:42:19.106 NWDBmss.getDBInstanceName() done: MYSERVER123
TRACE 2012-04-13 11:42:19.106 t_MssLogin.remove(WHERE Key='std')
TRACE 2012-04-13 11:42:19.122 t_MssLogin.insertRow({ Key:std Host:MYSERVER123 LoginType:WIN }), inserting
TRACE 2012-04-13 11:42:19.122 NW.hasABAP(undefined)
TRACE 2012-04-13 11:42:19.122 NW.hasABAP() done: true
TRACE 2012-04-13 11:42:19.122 NW.isAddinInstallation() done: false
TRACE 2012-04-13 11:42:19.122 NW.hasJava(undefined)
TRACE 2012-04-13 11:42:19.122 NW.hasJava() done: true
TRACE 2012-04-13 11:42:19.122 MSSTRC: odbc driver is installed.
TRACE 2012-04-13 11:42:19.153 MSSTRC: native client is installed.
TRACE 2012-04-13 11:42:19.200 TCP connections are not possible.
TRACE 2012-04-13 11:42:19.200 [iaxxgenimp.cpp:745] CGuiEngineImp::showMessageBox TCP connections are not possible to the specified server.

Please can you tell me how to resolve this?

Thanks.