2679373 - SWPM SYB: unable to set up backup server

Symptom

Error reported by SAP Installer is similar to the following:
Assertion failed: Unable to set up backup server. Refer to trace file sapinst_dev.log for further information.

Other Terms

ASE, backup server

Reason and Prerequisites

You are trying to install an SAP System based on ASE release 16.0 SP03 PL04 on the AIX platform. The host is configured to use virtual host names.
The SAP installer presents the message "Unable to set up backup server" and the installer's trace file sapinst_dev.log includes entries like:

Building Backup Server '<SID>_BS':
Writing entry into directory services...
Directory services entry complete.
Writing RUN_<SID>_BS file...
RUN_POP_BS file complete.
Starting server...
Unable to boot server '<SID>_BS'.  
Task failed
Server '<SID>_BS' was not created.

The corresponding backup server log file /sybase/<SID>/ASE-16_0/install/<SID>_BS.log includes traces like:

Started listener at tcp <IP ADDRESS 1> 4902
Backup Server: 2.24.2.1: The host '<IP ADDRESS 2>' is not authorized to connect to this Backup Server.
Backup Server: 5.40.2.1: Login host authentication has failed.

The root cause of the issue is that backup server does not recognize that IP ADDRESS 1 and IP ADDRESS 2 are the same host and requires a "remote host configuration". Further information about the topic can be found in the ASE documentation in the chapter "Remote Dump Host Control".

Solution

Create text file /sybase/<SID>/hosts.allow with the IP addresses from the backup server log with the following line:

<IP ADDRESS 1> <IP ADDRESS 2>

Set the file ownership to syb<sid>:sapsys with permission 640.
Terminate the running backup server with the OS command 'kill'.
Press the 'retry' button in the SAP installer dialog screen.