error: "Unable to browse instances" when select Oracle instance

Dear all,

I installed DP8 and integrate with Oracle 11gr2. But when i try to select Oracle instance to config backup job for database, Cell-manager display error "Unable to browse instances", so I can't config backup job.

I try rename client or restart servers but error still occur. 

I turn off all firewall, and test tellnet through port 5555 is success, but not solved error.

I attached detail capture and logfile debug.log inet.log.

Please help me, this error very urgent with me.

Thank you very much !

Best regards,

Thanhbom