From Time to Time error while executing RMAN Job

Question

Hi everybody,
i have a strange problem. From time to time i recieve following error when executing a Job from Grid Control (Enterprise Manager).
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-04004: Fehler aus Recovery-Katalog-Datenbank: ORA-12170: TNS: Connect Timeout aufgetreten
After that error the Job uses the Control File of the Database so the job runs. The strange thing for me is, that sometimes the jobs runs without problems and sometimes it gaves the error shown above.
For clarifying. Grid Control runs on a Unix (Sun Solaris) Machine and the target Database runs on a Windows Server in a DMZ. I tried to find out what the problem is but neither on the windows server nor on the firewall side there are any problems.
So can anybody help me finding out what the problem is?
Any help would be appreciated.
Greetings

Answer 1

Hi sunny,
i have tried the tnsping several times. There is no problem with this. The tnsping works without problems and in an appropriate time.
When i issue the command on our unix machine it shows the following:
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = srvxyz)(PORT = 1521))) (CONNECT_DATA = (SID = db1) (SERVICE_NAME = db1)))
OK (10 msec)
And when issue it on the Windows Server the follwoing output is shown:
TNS Ping Utility for 64-bit Windows: Version 10.2.0.4.0 - Production on 26-APR-2011 10:35:45
Copyright (c) 1997, 2007, Oracle. All rights reserved.
Parameterdateien benutzt:
O:\ORACLE\product\10.2.0\network\admin\sqlnet.ora
Adapter TNSNAMES zur Auflösung des Alias benutzt
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (COMMUNITY = tcp.world)(PROTOCOL = TCP)(Host = SRVXYZ)(Port = 1521))) (CONNECT_DATA = (SID = db1)))
OK (0 ms)
So any other ideas??