Connect isn’t dependent on flash from a client side perspective, this was changed a few years ago already when they brought in the Adobe Connect Plugin. In practice, this means that nobody attending a meeting needs flash, they will simply be asked to install the Connect Plugin/app the first time they enter a connect room (in much the same way as other solutions).
They recently further improved this process and released an Adobe Connect Desktop App: https://helpx.adobe.com/adobe-connect/using/adobe-connect-application-for-desktop.html There is some more info on this here: https://helpx.adobe.com/adobe-connect/connect-downloads-updates.html
Here is some info specifically addressing the end of flash: https://blogs.adobe.com/adobeconnect/2017/07/adobe-connect-on-web-conferencing-open-standards-and-the-end-of-the-flash-player.html
If we are talking about on-premise Adobe Connect servers, an option has to be enabled allowing tunnelling over port 443, and then it will allow anyone with basic web access (Port 80 & Port 443 – HTTP & HTTPS ports) to enter a room. From a hosted Adobe Connect perspective, nothing needs to be done as that option is enabled by default.
You can read more on this here: https://helpx.adobe.com/adobe-connect/kb/configure-ports-1935-443-80.html but the just of it is that Connect uses the RTMP protocol which uses port 1935 by default however if for any reason that port isn’t available (these days that is quite common) it can tunnel over port 443 (HTTPS port used for all secure communications).
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