Hitachi VSP G400 & G800 not getting discovered

We have an issue with 2x G400 & 2xG800 Hitachi VSP device discovery in SOM.

Other three Hitachi arrays are listed via HCS by SOM.

But the above 4 arrays are not getting detected in discovery logs.

When tried to collect via SVP, the arrays are getting detected in logs, but finally the discovery fails.

Any suggestion or Idea for this issue.