Captive Portal issue (ntlm 8091)

I had updated the firmware for sophos firewall yesterday and after that we are facing the captive portal issue.

Our setup:

We have STAS enabled for domain systems where users can use internet directly after logging into domain pc's, those who are out side domain environment will get a captive portal to access the internet. Since the latest firmware update, we are not getting redirected to the captive portal instead we get the ntlm page. I have attached screenshots. Need a solution.

Edited TAGs
[edited by: emmosophos at 7:29 PM (GMT -7) on 11 May 2022]
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