all the sudden unable to either save documents, templates or whatever

hello
all the sudden, I’m getting the following error when e.g. trying to save a template or a document:

Not Acceptable

An appropriate representation of the requested resource /manager/index.php could not be found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Interestingly, locally it works just fine - if I copy the database over to the server, it doesn’t work anymore.

Any ideas how to fix this?

Thanks

Problem solved: my host changed some security settings - all is working again