Created attachment 1017213 [details]
Journal report of bracktracing

Description of problem:
When using some public network in say Internet Cafe, Captive Portal seems breaking both Gnome X and Wayland Session endlessly and prompt to login screen. 

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Get in login session 
2. Try to use a public network 
3.

Actual results:
Attemot at authenticating to the public network causes backtrace 

Expected results:
Access to public network runs fine

Additional info:
An extract of backtrace

pr 21 20:08:19 muamba-telus1603 NetworkManager[895]: <info>  Connectivity check for uri 'https://fedoraproject.org/static/hotspot.txt' returned status '302 Temporarily Moved'; assuming captive portal.
Apr 21 20:08:19 muamba-telus1603 gnome-session[3741]: (SparkleShare:4474): Gtk-WARNING **: cannot open display: :0
Apr 21 20:08:20 muamba-telus1603 NetworkManager[895]: <info>  Connectivity check for uri 'https://fedoraproject.org/static/hotspot.txt' returned status '302 Temporarily Moved'; assuming captive portal.
[...]
Apr 21 20:08:23 muamba-telus1603 gnome-session[3741]: GnomeDesktop-WARNING: Failed to acquire idle monitor proxy: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
Apr 21 20:08:23 muamba-telus1603 gnome-session[3741]: WARNING: Application 'gnome-shell-wayland.desktop' killed by signal 5
Apr 21 20:08:23 muamba-telus1603 gnome-session[3741]: gnome-session[3741]: WARNING: Application 'gnome-shell-wayland.desktop' killed by signal 5
Apr 21 20:08:23 muamba-telus1603 gnome-session[3741]: Unrecoverable failure in required component gnome-shell-wayland.desktop