bes 5.0.4, bb's with v.6, 7, 7.1
the bb browser is forced to use the company proxy. in mds a proxy string is configured. some browser requests get answer : unknown host..., this is logged in mdat.log with: invalid http proxy server: unknown host <proxystring>
other bb browser requests are ok. so it's a sporadic problem that mds does not know / find the proxy