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ORA-43084: "Certificate is using forbidden or unsupported signature algorithm" (SQL*Plus) and TNS-12560: "TNS:protocol Adapter Error" (Tnsping) using 12.1 wallet with newly created (but default SHA1 / MD5) self-signed certificates (Doc ID 2803682.1)

Last updated on APRIL 17, 2023

Applies to:

Advanced Networking Option - Version and later
Information in this document applies to any platform.


After setting up SSL / TCPS communications using a note such as Doc ID 401251.1, you find that tnsping throws a generic error:
TNS-12560: TNS:protocol adapter error

Also, SQL*Plus is failing with the following error:
ORA-43084: Certificate is using forbidden or unsupported signature algorithm.


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