How to fix the Oracle error PGA-21210: unable to open connection with SNA services?

In this post, you’ll learn more about the Oracle ErrorPGA-21210: unable to open connection with SNA services with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

PGA-21210: unable to open connection with SNA services

Reason for the Error PGA-21210: unable to open connection with SNA services

Cause: The RRM was unable to initialize its connection with the SNA software for LU6.2 communications. An OS-specific error message precedes this message.

How to fix the Error PGA-21210: unable to open connection with SNA services ?

You can fix this error in Oracle by following the below steps

Action: Check the error information in the OS-specific error message to determine the cause of the problem, and take corrective action. Once the problem has been corrected, restart the RRM.