Argument out of range at NNTPClient.cs, line 676. The port is -1 and
the host is String.Empty. The url was: news://news.infragistics.com/infragistics.products.netadvantage.windowsforms.wintree
Looks like the Uri class cannot determine the host info for "news" scheme, but a port is completely
missing here and should somehow fallback to the default.
Should we have a "migration" task, that change old subscriptions with scheme "news" to "nntp" (our default now)?