ASCS HA

Please let us know what do you mean by "the PAS can not be accessed", what error did you find or encounter?

Please send us below info for further analysis:

1. dev_disp/dev_disp.old from PAS work folder

2. entire profile folder

3. dev_ms/dev_ms.old from ASCS work folder( from both 2 HA nodes )

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From the message server trace file, we could see the IP addr of 2 HA nodes:

[Thr 140031872051008] 1 : [10.0.234.14] (HOSTNAME)
[Thr 140031872051008] 2 : [127.0.0.1] (LOCALHOST)
[Thr 140031872051008] 3 : [10.0.234.10] (NILIST)
[Thr 140031872051008] 4 : [1.1.1.14] (NILIST)
[Thr 140031872051008] MsHttpInit: full qualified hostname = ASCS-A

[Thr 139922494183232] 1 : [10.0.234.15] (HOSTNAME)
[Thr 139922494183232] 2 : [127.0.0.1] (LOCALHOST)
[Thr 139922494183232] 3 : [10.0.234.10] (NILIST)
[Thr 139922494183232] 4 : [1.1.1.15] (NILIST)
[Thr 139922494183232] MsHttpInit: full qualified hostname = ASCS-B

And from dev_disp, we could see the dispatcher kept connecting to msg server through IP:port 10.0.234.14:3901.

As your system is running on HA, so we should set below parameters to HA virtual hostname in DEFAULT.PFL:

rdisp/mshost

enque/serverhost

Afterwards please check whether ASCS switch over works as expected.