Error code s1003 in Web Browser but not Apps

Plex Media Server Desktops & Laptops
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Server Version#: v1.30.0.6486
Player Version#: v4.99.2

When I try to play a movie or tv show through a web browser I get an “Error code s1003” every time. When I use the Plex app on my Roku or a Windows machine, however, everything works as-expected.

What accounts for this and how do I fix web browser playback?

I’ve seen a few posts re: s1003 that suggest unchecking “Use hardware acceleration” - I have it unchecked.

I see the problem on Plex Web v4.99.2 with Plex Server v1.30.0.6486 running on a Win 10 machine.

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App Version 1.30.2.6563
Web Version 4.87.2

Getting the same error and the web ui does not work beyond the home page loading. Any video you try to play throws a ‘s1003 network error’ and trying to click into a show or movie details results in “something went wrong”

All dedicated Plex apps work fine.

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