diff -Nur anaconda-21.48.22.134.old/pyanaconda/ui/gui/spokes/installation_source.py anaconda-21.48.22.134/pyanaconda/ui/gui/spokes/installation_source.py
--- anaconda-21.48.22.134.old/pyanaconda/ui/gui/spokes/installation_source.py	2018-12-10 08:21:57.762000000 -0500
+++ anaconda-21.48.22.134/pyanaconda/ui/gui/spokes/installation_source.py	2018-12-10 08:22:51.126000000 -0500
@@ -1069,9 +1069,6 @@

     # This method is shared by the checks on urlEntry and repoUrlEntry
     def _checkURL(self, inputcheck, combo):
-        # Network is not up, don't check urls.
-        if not self._network_module.proxy.Connected:
-            return InputCheck.CHECK_OK

         # If combo is not set inputcheck holds repo
         is_additional_repo = combo is None
