Unable to Access IPv6 on Plesk Sites
Symptom And Behavior:
After installing and switching to LSWS on Plesk, hosted sites are no longer accessible via IPv6
Cause:
LSWS requires an IPv6 listener directive which is not contained by default in Plesk's Apache configuration files.
Solution:
Add the following directive into /etc/httpd/conf/httpd.conf:
<IfModule LiteSpeed> Listen [::]:80 Listen [::]:443 </IfModule>
Graceful restart LSWS to take effect.