The web browser version only needs *.tytoonline.com whitelisted (i.e. tytoonline.com and its subdomains).
For installing the game, such as through our Windows install, you may need to whitelist more URLs if you re having any issues connecting. These include our services and analytics:
*.tytoonline.com (i.e. tytoonline.com and its subdomains)
The game only uses these two ports: 80, 443.
Also, some web filter software such as Lightspeed may identify the game communication as P2P and block it. If this happens, the following IPs will need to be specified to allow game communication: