Redirect http to https

This will allow initial connections over http, but always redirect them to https. If you just want to force authentication to occur over https, just use zmtlsctl mixed.

Edit Login.jps

This prevents the server from redirecting back to http if the initial connection is http.

In the file /opt/zimbra/tomcat/webapps/zimbra/public/Login.jsp, comment out this statement:

qs = emptyQs? "?initMode=" + currentProto: qs + "&initMode=" +
currentProto;

In other words, make it look like this:

//qs = emptyQs? "?initMode=" + currentProto: qs + "&initMode=" +
//currentProto;

Set mixed mode

This configures the server to accept both http and https connections.

su - zimbra
zmtlsctl mixed
tomcat restart