My client uses a Sametime Proxy and Sametime meetings for Web Audio/Video meetings using HTTPS. No problem about this if you have acquired from Verisign or another Certified Authority.

But if you use a private ssl key, browsers like Mozilla and Chrome, block to install add-ons. Is the same situation as a self-signed certificate.

To avoid this you can use an alternate site for Sametime.

Configure in ST Proxy

1) Connect to DMGR/System Console

2) Go to Sametime System Console -> Sametime Servers -> Sametime Proxy Servers and select your Sametime Proxy Server

3) On section Web A/V Settings, define

URL to host A/V Plugins: Specify the URL where the plugin will be hosted, including the port 

Webplayer Version: Specify the value of the WebPlayer Version in the VersionInfo.txt file included with the Web Meeting Room client package. 

Softphone Plugin Version: Specify the value of the WebPlayer Version in the VersionInfo.txt file included with the Web Meeting Room client package.

Click Save and OK.

4) Synchronize nodes and restart

Configure in stproxyconfig.xml

There is an undocumented option that solve a problem with Screen Capture plugin

Configure in ST Meetings

1) Connect to DMGR/System Console

2) Go to Sametime System Console -> Sametime Servers -> Sametime Meetings Servers and select your Sametime Meeting Server

3) Define the following variable

meetings.plugins.alternateUrl: Specify the URL where the plugin will be hosted, including the port

Click Save and OK.