Monitoring fails after upgrading ESXi hosts

[Hollow]

Dear community,

One of our ESXi hosts were upgraded from 4.1 to 5.5U2 and there is an error on Nagios monitoring that particular server:

CHECK_VMWARE_API.PL CRITICAL - Error: Cannot complete login due to an incorrect user name or password.

As the upgrade of the ESXi host was not done by me, I am not sure what went wrong.

Has anyone encountered this? Appreciated.

[rkennedy]

Did the credentials change at all when they upgraded the machine? What is the full command that is running to receive this?

[Hollow]

Case close!
For some reason, when upgrading from 4.1 to 5.5U2, the permission of the host is resetted.
Added back the login username and password and it works.

[hsmith]

Glad to hear it's working. I'm going to go ahead and close this thread.