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Can no longer access websites hosted on Plesk via IPv6.
Symptom And Behavior:
After install and switched to LSWS, hosted sites are no longer accessible via IPv6
Cause:
LSWS requires IPv6 listener directive which is not contained default by Plesk's Apache configuration files.
Solution:
Add following directive into /etc/httpd/conf/httpd.conf:
<IfModule LiteSpeed> Listen [::]:80 Listen [::]:443 </IfModule>
And graceful restart LSWS to take effect.