Opmanager does not collect data

Opmanager does not collect data

Hi all,
There are some problems that i'm facing with OPmanager although i dont know if the problem is Opman itself. Whenever i install opm it doesnt see all of the servers.
The weird thing is that when i uninstall it and reinstall it it sees the ones that it didnt and cannot see the ones that once did see. It cannot collect data for the graphs (CPU etc) and cannot distinguish the OS of the servers. The version i use is 6015. No firewall is on the servers, SNMP settings are fine. Could there be a problem to the network?
Please, any recommendation would be valuable.
thanks



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