Helpful ReplyHot!Captive portal attached to an interface but after authentication browser go loop

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tva79@icloud.com
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2018/10/22 02:29:19 (permalink) 6.0
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Captive portal attached to an interface but after authentication browser go loop

Hi all,
 I have attached a Captive Portal to my lan interface with a local group authentication.
 
From a pc client, when I open the browser for digit any website, the Fortinet login appear (correct)
 
I insert my username and password (correct)
 
Fortigate accept my credentials because I can see my user from "Monitor" -> "Firewall User Monitor" (correct)
 
the problem is now because in address bar of the browser, I can see a continuous loop of the address:
 
http://172.16.0.X/fgtauth?092321232323cdw2
http://172.16.0.X/fgtauth?021372123435ed82
http://172.16.0.X/fgtauth?010032723341c889
http://172.16.0.X/fgtauth?0933423487fd0fc44
 
and the website that I asked don't open.
 
Also if I open another tab in Chrome, I can see the same loop with the magic token that change continually.
 
Can I solve or debug this big problem?
 
I haven't found any documentation about diagnostic of Captive Portal feature.
 
thanks!
Andrea
 
 
 
 
 
 
 
#1
garylau
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Re: Captive portal attached to an interface but after authentication browser go loop 2018/12/03 01:58:18 (permalink)
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After upgraded to FortiOSv6.0 also face your problem.
My environment is Notebook>Wifi AP>FW
User after login success in (IE,Chrome,Firefox), the number at end of link path change continuous.
http://172.16.0.X/fgtauth?040b0181b0ea850a
http://172.16.0.X/fgtauth?xxxxxxxxxxxxxxxxx
Is there any changed in FortiOSv6.0? or bugs?
#2
TuncayBAS
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Re: Captive portal attached to an interface but after authentication browser go loop 2018/12/12 23:56:11 (permalink)
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maybe bug.
 
update to 6.0.3

Tuncay BAS
RZK Muhendislik Turkey
NSE 4 5 6
FCESP v5
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garylau
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Re: Captive portal attached to an interface but after authentication browser go loop 2018/12/13 17:34:20 (permalink)
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Thanks~
But already in FortiOS v6.0.3
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IOS
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Re: Captive portal attached to an interface but after authentication browser go loop 2019/01/23 05:59:54 (permalink)
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Hello friends,
I also have the same problem.
I haven't found the solution yet.
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SteveRoadWarrior
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Re: Captive portal attached to an interface but after authentication browser go loop 2019/01/23 13:57:37 (permalink)
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same here.  we use this more than you'd think to provide limited access to back end systems.
 
any leads on workarounds?
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thende
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Re: Captive portal attached to an interface but after authentication browser go loop 2019/03/19 14:11:25 (permalink) ☄ Helpfulby garylau 2019/03/22 02:31:03
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Hi guys.
 
I've fixed it with the following:
 
config user setting
set auth-src-mac disable
end
 
I think that by default Fortigate will also check on the mac address of the client trying to authenticate and if the client is behind a router before reaching the firewall the loop is the behavior we'll see. That setting above disables it.
post edited by thende - 2019/03/19 14:15:59
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garylau
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Re: Captive portal attached to an interface but after authentication browser go loop 2019/03/22 02:32:26 (permalink)
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Thanks thende
Fixed It's works for me~
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