CA ARCserve Backup requires a portmapper for its Remote Procedure Call engines. The Windows service - CA Remote Procedure Call server provides the portmapper functionality and uses the standard portmap port 111. This service can cause conflicts with some other 3rd party portmappers, such as Microsoft Services for UNIX, Noblenet Portmapper, PowerRPC Portmapper, and StorageTek Libattach, since two portmappers cannot co-exist on same machine.

When the CA Remote Procedure Call server initializes, it will detect any other active portmapper and automatically switch another unused port number. However, the same port conflicts may occur during the machine boot sequence and all the initializations of all Windows services. To avoid this problem, perform the following steps:

1. Change the Automatic status of the Windows Service "CA Remote Procedure Call server" to Disabled.
2. Create following registry key:

   HKEY_LOCAL_MACHINE\Software\ComputerAssociates\CA ARCserve Backup\Base\Portmap
   

3. Create the DWORD DelayedRegistration.
4. Assign a decimal value for this key indicating the number of minutes CA ARCserve Backup services should wait before initializing portmapper registration. For example, DelayedRegistration=1 causes all CA ARCserve Backup services to start but not register with the portmapper for 1 minutes after startup.

All CA ARCserve Backup engines will use the other active portmapper.