As per rfc 1964;
  "When a reference to a name of this type is resolved, the "hostname"
   is canonicalized by attempting a DNS lookup and using the fully-
   qualified domain name which is returned, or by using the "hostname"
   as provided if the DNS lookup fails. The canonicalization operation
   also maps the host's name into lower-case characters:

Currently we are not mapping the hostnames intolower case. This can cause interop problems.