Created On: 25 March 2011
Problem:
Server startup fails with the following error in the console.log and the server terminates abnormally.
CASSI0006S Error opening RDO file, reason = 05, subcodes (3,5)
This error occurs when the system attempts to open the RDO file which contains all the CICS resource groups and definitions. The RDO file is called dfhdrdat.
Resolution:
Using the ES admin console, edit the ES server, and go to the Server > Properties > MSS/CICS tab and check the value in the field named 'Resource Defintion File Path:'. It should specify a valid location where RDO file can be found. If it's blank, then it defaults to DFHRDAT file under install-dir\\base\\files\\sys.
Also, check the file permissions are sufficient for the ES Admin user to access the RDO file.
Incident #2486317