Thread:Project:Support desk/Update fails with 'Error code: ERR CONTENT DECODING FAILED'/reply

Do you know where the error message comes from? When I search it together with "MediaWiki", I get only 6 results; it is also there for several other systems (Drupal, WordPress) and not only MediaWiki. As to what you write, it also is not browser-dependant. So I think it is a problem in the server.

The error you get is error 330. According to internet posts, it happens when your HTTP request's headers claim that the content would be gzip-encoded, but it isn't. Turn off gzip encoding on the server level or make sure the content is in fact encoded.