The Pokémon TCG Online communicates with the game servers through three ports: 5222, 8181, and 39389. The game will not function properly if these ports are blocked by your router. The process for enabling outbound traffic through these ports is commonly referred to as Port Forwarding. Please review the documentation that came with your router, or visit the router manufacturer’s support page, for instructions on setting up Port Forwarding.
Some firewall, malware, or anti-virus software may require you to explicitly permit two-way communication with some domains by name. If this is the case for your security software, please add the following domains to the software’s whitelist:
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