Sophos XG with 15.5.4 MR-4-1 (occurrs on all the 17.5.x releases for us)
When connecting to my BYOD wireless network I have the captive portal enabled for that VLAN. Any laptops connecting do not have this issue, and the portal comes right up.. but I have this odd problem with both android and IOS devices and some kind of failed re-direct. Haven't found anything in the logs that is useful. The mobile devices often (but not always) initially refuse to pull up the portal with "ERR_CONNECTION_CLOSED" (see screenshot) unless I cycle wireless on and off several times on the affected device. I don't know why that fixes it, but executives here don't think that's an appropriate workaround. Have not been able to find a solution so far.. and last resort will be manual device registration with DHCP reservations and clientless auth as compliance says I have to maintain full accountability.
Anyone else experienced similar or have any suggestions?
Thanks!
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