Oracle 10g Listener problem
As Phil Says I replaced hostname with Actual IP but the connection prblem was for 

(PROGRAM = extproc)


In listener.ora file, Removing it solved the issue.

To let external procedures work these changes should be done:

Adding new SID entry in SID_LIST_LISTENER SID_LIST with SID_NAME = SID in tnsnames.ora at EXTPROC_CONNECTION_DATA and PROGRAM = extproc and a proper ORACLE_HOME(Environment variables can be added)

In ADDRESS_LIST in LISTENER part of listener.ora new ADDRESS Entry should be added with PROTOCOL = ipc and KEY = EXTPROC