Configuration

First of all, these tests were performed on an HP-Pavilion 15 laptop, on Windows 11, as this game is typically not supported on Linux. It could be possible to run tests with Proton, and it would be an interesting to see in the future if this has an impact on the support of IPv6.

Error encountered

While trying to connect using the game client of League of Legends, we encounter an error saying “[…] Error during the login session […]”

The picture below provide the exact error encoutered:

Hypothesis about the cause of the error

We then did a packet trace to try to understand the reason why we couldn’t connect to the server. This trace also is available using the following link

In this trace, we can observe that the AAAA records are obtained successfully for all the domain name resolved, but we receive a bunch of TCP segments with the RST flag set. We don’t know if this is just a typical work-around to avoid maintaining a session for 2*MSL, or if there really was an error in the communication with the server. Briefly, MSL, which means Maximum segment lifetime, is the maximum time during which a packet could be present in a network.

The real cause of the problem seems thus quite undefined according to us, as no abnormalities were seen in the traces except for the high number of segments with the RST flag set.