I am currently having an issue with captive portal and IE8.

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I am currently having an issue with captive portal and IE8.

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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?


L6 Presenter

Hi Jecker,

May I know what PAN-OS version is being used?


Hardik Dinendra Shah

May be this doc can help.

Unable to Display WebUI using IE8 or IE9

Where do I find the PAN-OS version?

I see:

User ID agent is 5.0.4-5

Software version on PA 2020 is 5.0.5

application version is 392-1950

Threat Version is 392-1950

URL Filterins version is 4166

are these helpful?

I tried IE9 and it works perfectly, it is just IE8 that has the problem with or without compatibility mode on.  😕

Hi Jdecker,

I would suggest to do wireshark capture while trying with IE8, I will provide next feedback after getting capture.


Hardik Dinendra Shah

L5 Sessionator


Bug 52322:

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.

Thank you


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