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Intermittent SSL Negotiation Error on Handshake: java.lang.IllegalStateException: Not PKCS#1 block type 2 (Doc ID 1285772.1)

Last updated on SEPTEMBER 05, 2021

Applies to:

Oracle WebLogic Server - Version 10.3.2 and later
Information in this document applies to any platform.


The SSL negotiation error intermittently occurs on a stale SSL connection during the handshake.

The error is as follows:

java.lang.IllegalStateException: Not PKCS#1 block type 2

This error is seen while connecting to the Oracle Weblogic server using a .NET client.

Below is the error seen in the logs :

Stack Trace :





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