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Do you have sqlnet.ora timeout parameters set?
If not I would consider setting. I can post an example if you want.
Add these to both servers
INBOUND_CONNECT_TIMEOUT_ = 120
SQLNET.INBOUND_CONNECT_TIMEOUT = 120
Then stop and start the listener.
You can consider this too :
These may also help :
How to resolve MRP stuck issues on a physical standby database? [ID 1221163.1]
Troubleshooting - Heartbeat failed to connect to standby [ID 1432367.1]
Edited by: mseberg on Nov 2, 2012 5:00 AM