This information is in addition to the General Connection Problems help article.
For connecting to the application you need to allow access to the following URLs:
HTTP and HTTPS for these domains
Note: The game launch (clicking the Play button) currently does not support proxies, so please also allow: assetgame.roblox.com
Once the game launches, it uses UDP ports 49152 - 65535. The IP ranges can be diverse and specific information may not be able to be provided in order to whitelist individual IPs.
Errors Logging into Roblox Studio
When logging into Roblox Studio, you may get an error message saying something like: "Too many logins were attempted from this network. You must log in through a web browser".
To login into Roblox Studio, you will need to open a web browser and log into your accounts there. This adds an extra layer of security to prevent account cracking. Our engineers are currently working on improving the login so users will only need to do this process through Roblox Studio and not a web browser.