Communication
Poco supports TCP and UDP protocols. Poco use UDP port 9099 as its default login port.
If port 9099 is blocked, Poco use UDP port 9091 to login instead but can't chat with friends.
Poco use TCP port 5354 to download files.
If UDP port 9099 and 9091 are all blocked, then Poco will fail to login.
If TCP port 5354 is blocked, then Poco can't download files.
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