The default behavior of VRM is to redirect requests from "HTTP" to "HTTPS" via the HSTS setting.
HSTS, what is this: HTTP Strict Transport Security - Wikipedia
This can be seen and changed in BVMS Config Client or CM
Please note: Never change VRM or any device settings via CM if they are managed by BVMS - BVMS will revert the settings back to previous state as set in BVMS Cc
VRM network and port settings:
How to disable VRM port 80:
How to enable VRM HTTP port 80 without redirecting to HTTPS port 443
Not recommended to disable HSTS as this can open your system to Man-in-the-Middle attacks.