antiX-19 full and base ship with connman network manager.
Some users have reported problems connecting either via the gui or cli.
If this is the case, this may fix it.
Edit /etc/sysctl.conf by commenting or removing these lines (as privileged user)
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
You might need to reboot and then try connman gui again