Attempt to create ADFS connection returns "Error! ... Either adfs_server or fedMetadataXml must be set but not both."

Knowledge Solutions
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Problem statement

We’re facing one strange issue while creating an enterprise connection for an existing ADFS metadata URL. There is already a connection existing using this URL. But when we tried to create a new connection it’s always throwing an error:

"Error! Something happened while trying to save your connection: Either adfs_server or fedMetadataXml must be set but not both."

I’m not uploading the metadata file, but instead, I’m just proving the metadata URL in the Dashboard.

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Cause

This is caused by the metadata URL using an unsafe renegotiation configuration for TLS/SSL. Unsafe renegotiation is not supported after API2 was upgraded to node 18.

Solution

As a quick workaround, you can load the federation metadata in a browser and then upload it as a file, though the OpenSSL/TLS versions running on this host should be updated to support safe renegotiation ASAP.