forked from samuel-p/sp-codes.de
60 lines
2.5 KiB
Markdown
60 lines
2.5 KiB
Markdown
---
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layout: base.njk
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key: connectivitycheck
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title: Captive Portal Check
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---
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# Captive Portal Check
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A captive portal is a login page in public WLAN networks to restrict Internet access to the approval of certain terms of use. When you see a login page on a public network, your device uses a captive portal check. This allows the device to find out whether you have direct Internet access or not. In Android, for example, your device sends a request to a Google server.
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Since mid 2019 I provide a free Captive Portal Check: [https://connectivitycheck.sp-codes.de/generate204](https://connectivitycheck.sp-codes.de/generate204) You are welcome to use it if you like.
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## Setup in Android
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To change the Captive Portal Check in Android, you need a terminal app or a connection via ADB to a computer.
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To use `http` you can run the following commands with the respective method:
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```
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# settings put global captive_portal_use_https 0
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# settings put global captive_portal_http_url "http://connectivitycheck.sp-codes.de/generate204"
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```
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To use `https` you can use the following two commands:
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```
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# settings put global captive_portal_use_https 1
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# settings put global captive_portal_https_url "https://connectivitycheck.sp-codes.de/generate204"
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```
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Maybe you have to reboot your phone after updating the settings.
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If you are using AFWall+ you need to give access to _[1000] Android-System_ and in some cases _[10040] CaptivePortalLogin_ to make it work.
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## Setup in Ubuntu
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In Ubuntu, the file `/etc/NetworkManager/NetworkManager.conf` must be changed. Add or change the following lines:
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```
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[connectivity]
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uri=https://connectivitycheck.sp-codes.de/generate204
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```
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Restart the network-manager:
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```
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sudo service network-manager restart
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```
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## Setup in Firefox
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Type [about:config](about:config) in the Firefox address bar and search for `captivedetect.canonicalURL` and `network.connectivity-service`. Set the URL values to `https://connectivitycheck.sp-codes.de/generate204`, the domain values to `connectivitycheck.sp-codes.de`. That's it.
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## More useful links
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* [Captive Portal Wikipedia](https://en.wikipedia.org/wiki/Captive_portal)
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* [Source code](https://git.sp-codes.de/samuel-p/connectivity-check)
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* [Docker Image](https://hub.docker.com/r/samuelph/connectivity-check)
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* [Setup on Android](https://android.stackexchange.com/a/186995/288049)
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* [Setup on Ubuntu](https://askubuntu.com/q/1167177/920103)
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* [Captive Portal Kuketz Blog](https://www.kuketz-blog.de/android-captive-portal-check-204-http-antwort-von-captiveportal-kuketz-de/)
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