I'm trying to add my Rust Server via Rcon, but it always gives connection failed in the test.

Via Plugin some players complained that they don't receive packages correctly. So, I preferred to add via Rcon, but it doesn't seem to work that well either.

Has anyone ever experienced this?

Yes, my rcon.web is set to True.
Yes, RCON is functional, use via RustAdmin no problem.

I found that for game type it is necessary to create a separate webstore for use by Rcon or Plugin. Here's a tip to everyone, thank you!