Unable to monitor OpManager itself via WMI

Hi,
We have OpManager installed on vm (vmware) Windows 2008 R2 based. I'm unable to monitor this server in OpManager via WMI. SNMP works fine. Whenever I'm testing credentials SNMP says 'passed' and WMI immediately (no longer than half second) shows 'failed' like it wouldn't try to connect at all.
I've compared snmp, wmi config on that server with almost same vm machine running same os and configuration is almost 100% same. That other machine is being also monitored via local admin account in OpManager and WMI works fine. I've tried to test credentials for OpManager server in WMI using local admin accounts, domain admin accounts. None was working. After week of fight I'm struggling to find answer and I'd really appreciate if someone could help me with this one. Print screen attached. Credentials are 100% correct, server was restarted few times, along with WMI service.