Ubuntu – No route to host error when trying to login in a public wifi hotspot

networkingwireless

I'm using Ubuntu 18.04.2 LTS, kernel version 4.15.0-47-generic.
In the office we have a public wifi hotspot. However, when I connect, I have to accept some terms and conditions before I can use the internet. This does not work on Ubuntu though, I get an "No route to host" error message for this page.

It works when I reboot and accept the terms and conditions in Windows, then reboot again to Ubuntu. I can directly connect.
For other wifi hotspots (at the airport or hotels) I don't have this problem. So this only occurs for this one wifi hotspot.
I've already checked the URL for the login page I get forwarded to, which is correct.
I've tried setting DNS servers manually in nm-connection-editor (using the DNS hosts that are used on my Windows machine for this hotspot), without success
I've tried sudo dpkg-reconfigure resolvconf, without success

What can I do to find and fix the issue such that I can login and connect on this wifi hotspot as well?

Best Answer

Finally, I found the issue. The problem was the docker daemon creating network bridges that claimed the subnetwork 172.16.0.0, 172.17.0.0, ... and the wifi-hotspot-service I needed to connect to had an IP that was in one of the above subnetworks.

What helped me:

Remove the docker containers I didn't need anymore
Run sudo docker network prune to delete unused docker networks
Change the default docker0 bridge IP address (in my case docker was installed via snap, i.e. add "bip": "192.168.154.1/24", to the file /var/snap/docker/current/config/daemon.json)
Restart docker-daemon (or your system)

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Ubuntu – Cannot log in to public open Wifi connection

Here is what I have found works for forcing the captive portal (i.e., login page for WIFI connections on public hotspots):

Make the connection to the WIFI.

Open a terminal and type route. You should receive a display such as:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface    
default         10.1.0.1        0.0.0.0         UG    600    0        0 wlo1    
10.1.0.0        *               255.255.248.0   U     600    0        0 wlo1    
link-local      *               255.255.0.0     U     1000   0        0 wlo1```

Type the default Gateway (i.e., 10.1.0.1) into your browser's address bar, you will receive the WIFI login page.

Ubuntu – Cannot reach public WIFI login page in Ubuntu 18.04 Captive Portal Issue

I had the same problem.

Internet was not working
Captive Login Page did not show up automatically
Wifi icon was a question mark ( ? )

I managed to login by visiting the login page at: https://1.1.1.1/login.html

Once logged in, I was in the same situation as before, but then the problem was only DNS:

curl -v example.com returned, after some time, "Could not resolve host: example.com".
Good news: I could succesfully ping Google DNS 8.8.8.8 with ping 8.8.8.8

I added 8.8.8.8 to the DNS server list for my WiFi connection, via the following steps:

Click on the WiFi icon (mine was a question mark, because WiFi was not working)
Click on the WiFi network name, then Wifi Settings, then the wheel close to my WiFi network, then IPv4 tab
Wrote 8.8.8.8 in the DNS text box (leave "Automatic" DNS switched on)
Apply changes
Restart network manager: sudo service network-manager restart

And it worked for me.

systemd-resolve --status now returns two DNS Servers for the WiFi connection, the first one is the DNS assigned by the network, the second one is 8.8.8.8

I hope this can help.

Best Answer

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Ubuntu – Cannot log in to public open Wifi connection

Ubuntu – Cannot reach public WIFI login page in Ubuntu 18.04 Captive Portal Issue

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