Hi Plam,
1) Yes, I am using Windows vCenter Server 6.7 U1 - it was an upgraded version from 6.7GA (maybe that is relevant?).
2) I am currently testing directly on that machine, using the virgo client from the vCenter directly (the remote plugin is running on another machine).
3) I am using the browser directly on the vCenter machine - this shows the 503 error.
Just as an extra test, I started a virgo server from my 6.7U1 sdk (on still another machine) - and when I call
>https://mySdkTestMachine:9443/api/ui/htmlClientSdk.js
I can download the file as needed.
Now I went to the vcenter to find the file you need, and noticed that it is dated for the 24th. of April..
Is this perhaps from the old 6.7GA version?
Cathy