Hi Sergiu, I'm using default installation (HLSQL+Jetty). The message itself appears at the bottom of the page in the same place where "Saving..." and "Saved" appear. So my guess would be that it is still XWiki, or at least it wraps some stuff underneath.

And also strange is that it works for same attachment in other space. Andrey From: Sergiu Dumitriu<sergiu(a)xwiki.com> > On 10/10/2011 07:15 AM, Crowd Covered wrote: > >> Hi guys, >> >> When deleting attachment, I've got following error message: "Failed to >> delete attachment: ( The request was rejected by HTTP filter. Contact >> server >> administrator. )" >> It is just a *.doc, added by other user and updated to once to 1.2 >> version. >> Tried also to delete as admin to no success. In Sandbox webspace I create, >> update and delete such an attachment without problems. >> Search on the web by error message didn't bring correlating results. >> >> Can someone hint why is this happening and how to solve it? May it be smth >> about user rights? >> Thanks, >> Andrey Stoliarov >> > > This error doesn't sound like anything that XWiki generates, it looks like > a server configuration issue, with the Apache HTTPD reverse proxy set up, > assuming that's what you're using. >