Cannot catalog db2 db in toad

Hello guys,

I am new in Toad world. I have a database on an AIX server and I don't know how to add it in toad interface. I tried to catalog the database but I keep receiving the same error:

ERROR [08001] [IBM] SQL30081N  A communication error has been detected. Communication protocol being used: "TCP/IP".  Communication API being used: "SOCKETS".  Location where the error was detected: "9.51.102.135".  Communication function detecting the error: "recv".  Protocol specific error code(s): "*", "*", "0".  SQLSTATE=08001

Thanks in advance for your help!!