The Weather Diagnostic popup does not talk to OpenSprinkler but rather polls Weather Underground. Therefore, this is an unrelated issue and suggests something else entirely.
Which app are you using?
This is considered an advanced topic and not something we have a guide for and is left for the user who is capable of performing such a task. Don’t get me wrong, I don’t think this is ideal and we are working on a solution to avoid port forwarding and having to use SSL proxies to ensure security.
Also, I have never used lighthttp so sending me the config really won’t help much.