** Description changed: + [Impact] + + * More captive portals have been discovered that do not handle DNS requests with D0 set. + * Thus extend previous aruba-networks fix from https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1727237 by retrying all NXDOMAIN results with lower feature levels just in case. + + [Test Case] + + * systemd-resolved something-nonexistant.ubuntu.com + * monitor the logs, and check that the transaction has been downgraded multiple times and tried at least once at a feature level below D0. There should be a downgrade message in the log. + * Note, it will be cached, thus one may need to call $ systemd-resolved --flush-caches + + [Regression Potential] + + * Legitimate NXDOMAIN queries will now take longer, as they will be + retried multiple times with different features sets until an answer is + found. At that point the query will be cached and will return quickly. + This is needed to work-around bad captive portals that do not support + dns queries with D0. Post-captive portal, the feature level can usually + be cranked back up and it does after a grace period. + + [Other Info] + + * Original bug report + I was asked to create a new bug for this in https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1727237 as it seems to be a different issue. I have installed the nightly image of Kubuntu Bionic from 25th of April. There systemd is in version 237-3ubuntu10. When connecting to the wifi hotspot in my hotel (Quality Hotel Augsburg) I cannot open the hotspot landing page that should give me access to the WIFI. With Windows and on an Iphone it's working. For the following distributions I can confirm it not working: Kubuntu 17.10 Kubuntu 18.04 (nightly image 25th of April 2018) The logs were taken on 18.04. Workaround: sudo systemctl disable systemd-resolved.service sudo service systemd-resolved stop sudo rm /etc/resolv.conf sudo nano /etc/NetworkManager/NetworkManager.conf >> add "dns=default" under [main] sudo service network-manager restart Then I can connect to the WIFI and I see the login page in Firefox. To capture some data I did the following: - connect to Hotspot - enter golem.de Case 1: Fresh default Kubuntu install With a default Kubuntu install it does not work. I can connect to the WIFI and get IP and DNS from DHCP but I cannot resolve any hostname. When trying to open the router ip directly in the browser it forwards to hotsplots.de which cannot be resolved. Case 2: With aforementioned Workaround I connect to the wifi, I open firefox and the login page shows up (if I havent been connected yet. In the capture I already was able to connect to the hotspot which allows immediately to connect to the webpage) PS: I'll be in this hotel till Friday 27th if more information are required.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766969 Title: DNS cannot be resolved in Public / Hotel / Starbucks WiFi Hotspot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
