Note IPv6 Issues is README.md

[edalex-ian]

There are some settings in the test institution which setup up security policies which check incoming IP addresses. This can be problematic on machines which are configured with dual stack, causing tests such as com.tle.webtests.test.users.TokenLoginTest to fail.

One option is to simply run your target server with the additional JAVA OPT of -Djava.net.preferIPv4Stack=true. Maybe there's also other options...

Either way, it's worth documenting this in the README.md.