I'm having a similar problem to others in that the Alfresco Mobile client gives an "invalid credentials" error connecting to Alfresco Community 5.0 d . However running the suggested tests I've run into a strange error.
When I go to myserver/alfresco/cmisatom I seem to get two different http auth requests. The first one always fails. However, if I cancel it, I get a second slightly different one (the dialog box is wider), and on this one I can authenticate. I'm guesing this has something to do with why the mobile app gives authentication errors.
Any clues where I can look for the problem ? My server is configured to authenticate from our active directory server via passthrough.