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Added: 11.04.2018 12:51:44 Last updated: 11.04.2018 12:51:44
Most cases where you get a "406 error message - not acceptable" this is due to the mod_security module. This is a type of firewall application that runs on all of our web servers.
Mod_security scans all traffic for violating these rules. If an action that violates any of these rules occurs, the server may provide a 406 error message.
The error message is very rare and in most cases the problem will be resolved by turning off the mod_security rule that causes this.
If you get this error, contact support so we can check this further for you.