Try to access controllers directly connecting them through Serial cable (Part number:592266-001)
Please find the guide to connect to Controller CLI port,
https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-c03820027
Then restart both management controller,
# restart mc both
This will not restart or reboot storage controllers so no impact in production
Hope this helps!
Regards
Subhajit
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