How do I get rasplex to connect to my plex media server via wifi without internet?

My setup is fairly simple, I have rasplex on my raspberry pi which wirelessly connects to my router which is in turn connected via ethernet cable to my server(laptop). It worked perfectly till I moved to an area with no internet and now I cant sign in obviously.

Is there there any way around this? Im a total noob when it comes to the pi and all this.

Any help would be much appreciated.

Thanks.

Have you tried disabling Secure Connections in PMS?

Regards