Synology model?
DSM version, 6 or 7?
What version of Plex Media Server did you install? 1.29.x.yyyy, 1.30.x.yyyy, etc.
What is the IP address of the NAS?
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Use a PC on the same network as the NAS.
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Use a private/incognito browser window.
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Point the browser at the IP address of the NAS.
For example, if the IP address is 10.1.2.3, use http://10.1.2.3:32400/web.
Use http, not https. Also, :32400/web is important.
If things work correctly, you should be prompted to login to Plex Media Server and create media libraries.
Documents that can assist:
Installation & Setup of Plex Media Server on Synology
