Hi Yann and thanks for your reply.
The output is the following:
DR8020::*> vserver services web show -name sysmgr -instance
Vserver: DR8020
Service Name: sysmgr
Type of Vserver: admin
Version of Web Service: 1.0.0
Description of Web Service: OnCommand System Manager
Long Description of Web Service: The OnCommand System Manager web service
Service Requirements: disco>0.0.0, ontapi>0.0.0
Default Authorized Roles: admin, readonly
Enabled: true
SSL Only: true
Finally the problem was solved yesterday, I had to shutdown all hosts
and reboot one of the nodes.
I hope NetApp finds a solution for this case, it's not the best practice to shut down all your hosts to regain access to the storage...
Apostolos Gkavanozis