Cloudflare just realese WebSockets for all CloudFlare costumers https://support.cloudflare.com/hc/en-us/articles/200169466-Can-I-use-CloudFlare-with-WebSockets-

@yariplus i test this in various environments and in some i need to login first in the live.example.com to set the cookie and then i can login in the example.com domian without the invalid session error. I hope it get fixed in the upcoming releases. Also in some i have to disable the emoji extend plugin.

Re: Forum constantly throws Invalid sessions

After fallowing @lenovouser tutorial Using Cloudflare with NodeBB

Go to your cloudflare dashboard> caching>caching level and select
- No Query String -

Then Purge everything under purge cache session and reload your website.

I hope it helps people looking for a solution to this problem.

its not much but at least you can have some of the cloudflare features on.

You can check my forum, it is working after 3 days looking for a solution : ParaLocos.org