How can I resolve the errors "Daemon socket connection error" or "Invalid Operation" for my CloudHSM client?

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I tried to connect to the key management utility (KMU) command line tool or the AWS CloudHSM client. The connection failed and I received the error "Daemon socket connection error" or "Invalid Operation".

Short description

CloudHSM Client software uses a client daemon to connect and perform operations on the HSM with the KMU command line tool. These errors occur if:

The client daemon is stopped.

-or-

The client configuration file doesn't contain the IP address of an active and reachable HSM in the cluster.

Resolution

Follow the instructions for troubleshooting lost connections to the cluster.

Note: This resolution is for use only with Client SDK 3, not Client SDK 5. For more information, see AWS CloudHSM Client SDKs.

Related information

Troubleshooting AWS CloudHSM

Which CloudHSM certificates are used for the client-server end-to-end encrypted connection?

How do I restore a CloudHSM cluster from a previous backup?

AWS OFFICIAL
AWS OFFICIALUpdated 3 months ago