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Help Captive Potal Detection for Samsung Products

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ksabo

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Jun 10, 2016
1
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#1
Hi all,

Designing a NAC for work and I am having trouble getting Samsung devices to recognize the user must sign in to a captive portal for network access. I have managed to find the URLs that other products use for captive portal detection (i.e. captive.apple.com for iOS, and most Androids use clients3.google.com/generate_204). In fact, every device I have tested (apple, motorola, older samsungs, lg, nexus) seems to present the user with a pop up stating they need to log in to the WiFi. Newer Samsung devices (confirmed on Galaxy Note S5 and Galaxy S7) are not presenting this pop up. I think Samsung has butchered the Standard that Google created and I am wondering what URL they use for Captive Portal Detection in their newer devices.

Thanks!
 
#3
Same problem here

when the phone connects, it doesn't do any DNS requests at all on any domain.
It goes directly on the http server hosting the captive portal page, I guess using only the gateway's IP.
It tries 3 times within 3s to get the /generate_204, then once again 1 min later. After that it stops trying until the user goes in the browser. From there everything works as expected.

I haven't seen any behavior like this with any other phone
Any solution is welcome
 
Upvote 0
#4
Hello, I have an issue detected only on samsung s4 and j7 but ok on others (ios, lenovo, asus, huawei)
I installed a webserver with captive portal on a raspberry with a hotspot (nginx/apache2/lighttpd, hostapd, dnsmasq) when i connect to this wifi network a popup "Sign-in to network" is displayed or an auto launch of the captive portal page is done.
This behavior failed only on some samsung smartphone like s4 and j7, when i connect nothing happened!!! no popup nor auto display CP page
any proposition?
 
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