Sites using MySQL databases and the cfqueryparam tag will see the following error message:
CF Error: Error Executing Database Query. Communication link failure: Unknown command
The error will point to a line within the site's code containing a database query. That line will have something like this in it:
WHERE example =
This can be fixed by changing the code to remove the cfqueryparam tag. For this example, this would be changed to:
WHERE example = '#examplevalue#'
Please note: this only affects sites running under Cold Fusion 7.0.2.