Symptoms: when a user logs in on an XP or Win 7 machine with IE 8 (Generic Windows login) and opens IE they will get "Page cannot be displayed" for any website. This is not a standard PA "Webpage blocked" message just the standard "Page cannot be displayed". If you click refresh 7,8,9 times (no set pattern) eventually you will get the Captive portal prompt. Tried IE 7 on XP and IE 9 on 7 and all is well, go to a web page and instant CP prompt. Problem is that my EMR system for the hospital requires IE8 and only IE8 to function properly until next update (Next Year). Does anyone know why this would be happening?
When a user was prompted with a Captive Portal prompt with NTLM enabled and then successfully authenticated, on some occasions the user was prompted to authenticate again. This was observed with the Internet Explorer browser.
The issue was fixed in 5.0.6 and 4.1.14. The issue mentioned above seems similar to what you are seeing. Also reading details of the bug it seems when bug was filed IE8 was being used.
If upgrading is a possibility i will recommend upgrading to 5.0.6 and then retesting.
Hope this helps.
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