Windows Server 2012 R2 - RD gateway certificate issue

I need some help installing certificate on RD gateway for RemoteApp service.
There is no issue with IIS it works ok with letsencrypt certificate. Also it works good with RDgateway
outside LAN.
But a warning message pops up when you try to open an app from remoteapp website.

It says : “cannot check certificate revocation status”. if i click on Yes to continue it work flawlessly, but i would like to get rid of that annoying warning.

Thanks.

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