Monday, September 14, 2015

Error accesing EM 12c Cloud Control weak ephemeral Diffie-Hellman public key

After Chrome and Firefox browsers get some security updates i cannot access the Oracle Enterprise Manager 12c console. The browser (Chrome 45.0.2454.85 on Ubuntu 15.04)  reported that:

Server has a weak ephemeral Diffie-Hellman public key

ERR_SSL_WEAK_SERVER_EPHEMERAL_DH_KEY

There is a document in oracle support 2054204.1 that describes the problem. I also try Firefox in the latest version but the problem remains. I also cannot access the console of Admin Server.

After reading this post https://community.oracle.com/message/13293563 i realized that its possible to access the Oracle Enterprise Manager Cloud Control 12c using the http console port also and not using the managed server port. This works for me and i can access the Cloud Control console from Chrome and Firefox again.

Access to Admin server is still not possible and i have to wait for a patch to come as the post from Oracle suggests.

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