BNETDocs
C>S 0x14 SID_UDPPINGRESPONSE
Message Id:0x14
Message Name:SID_UDPPINGRESPONSE
Direction:Client to Server
Used By:Diablo Retail, Diablo Shareware
Starcraft Japanese, Starcraft Broodwar
Starcraft Shareware, Starcraft Original
Warcraft II BNE
Format:

(UINT32) UDPCode 

Remarks

Enables UDP support.

Server supplies code via UDP packet PKT_SERVERPING (0x05). Usually 'bnet'.

Not responding will give you a UDP Plug in chat (flag 0x10).

You should send this anytime between S>C 0x50 SID_AUTH_INFO (or equivalent) and C>S 0x0A SID_ENTERCHAT. Sending this packet before or after these two packets will get you disconnected from official servers.

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