Vcenter 6
Please check the below points if you're having problem with Vcenter discovery in OpManager.
1. Provide the same credential for the Vcenter in OpManager which is used for MOB connection/Vsphere client.
2. Ensure there is no special characters available in the password.
3. With Vcenter 6, Two new settings are now available under the ESXi Host Advanced System Settings page:
Security.AccountLockFailures:
Maximum allowed failed login attempts before locking out a user’s account.
Security.AccountUnlockTime:
Duration in seconds to lock out a user’s account after exceeding the maximum allowed failed login attempts
Sometimes it gets violates even if you provide valid credential then it will throw invalid Login exception. You can increase it from Configuration > Security
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