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That error is related to WebAdmin console. If you login again, it should work.
You should try to add proxy server IPs as trusted IP,
http://www.litespeedtech.com/docs/webserver/config/security#accessControl_allow
5.0 build 2 is available now.
To use HTTP/2, you need to make sure cipher
ECDHE-RSA-AES128-GCM-SHA256
is the first one in your cipher configuration.
our default is
it works for HTTP2.