Remote Oracle Net connections hang at Authentication point or end with ORA-3135
(Doc ID 1302367.1)
Last updated on OCTOBER 06, 2020
Applies to:Oracle Net Services - Version 126.96.36.199 and later
Information in this document applies to any platform.
Something may occur where there is a connectivity problem between clients or servers and a remote Database such as a Standby or DR site.
What happens with a SQL*Plus test is that any attempt to connect results in a hang while a local loopback on the Database server using the same TNS connect string and listener works fine.
For example, on the remote client or server:
sqlplus <username>/<password>@Remote_sid --> hangs
On the local Database:
sqlplus <username>/<password>@Remote_sid --> connects
An interesting fact is when the wrong username or password is deliberately given (for test purposes), then the ORA-1017 is returned, indicating that the Listener has, in fact, located a Database and handed off the client connection.
A similar situation can occur but instead of hanging, the Client may abort with an ORA-3135 error.
This may be a new installation but no changes have been observed from an Oracle standpoint
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