Change the encryption key on the manager side or on the agent. If you remember the key, then enter it in the manager (Topology -> Agent).
Note: The key is preceded with 0x when installing the agent, do not enter 0x on the manager side.
If you don't remember the key, then:
1. Take the key from Manager and login to the Agent host.
2. Open a Command Prompt (Windows) or a Terminal (ssh to host if Linux or UNIX)
3. Navigate to the CA WA Agent install directory. E.g. /opt/CA/WA_Agent or C:\Program Files\CA\WA_Agent
4. Execute the keygen utility with key and cipher. E.g.
Note: The above is an example key. Use your own 32 character long hexadecimal key. Hexadecimal allows 0-9 and letters A-F. 0x is needed on the Agent side only. Do not add the 0x in Manager Topology, just the key.
By default, the cryptkey is stored in cryptkey.txt, which is located in the Agent install directory