Could you please recreate the connector using the below steps:
1) Navigate to ColdFusion2016\cfusion\runtime\bin directory and run wsconfig as "Administrator"
2) Remove the existing connector for this website
3) Add the connector again
Is this error thrown on accessing any CFM page, or a specific one?
The error thrown seems to indicate one of the unsupported HTTP request types (PUT, DELETE,.. ) is being requested.
If the above is true, IIS tweaks are required. See the below link for more,