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Packet ID1050x69
Authentication // wire record

SteamSessionTicket

The retail client's first application handshake packet. It carries the opaque Steam session ticket that a Steam-enabled game server must validate before accepting the player's identity.

C→SHandshakeLive-verified5 + N bytes
Exact field order

Packet 105 wire layout

The first byte is the application packet ID. The rows after it appear in decode order. Sizes exclude ENet headers, the outer wrapper prefix, LZF chunk framing, and compression effects.

Packet 105 SteamSessionTicket fields in byte order
#FieldEncodingBytesPurpose
0packet_idu81Always 105 (0x69).
1ticket_sizei32 LE4N: ticket length; reject negative values and lengths beyond the remaining packet.
2ticketopaque Steam ticket bytesNTicket bytes supplied by the Steam client API. Treat as secret, bounded binary data rather than text.
Protocol convention

How to read this layout

  • LE means least-significant byte first.
  • fixed16 is two-byte sign-magnitude at 1/64 precision.
  • orientation16 uses the measured 1/8192 orientation mapping.
  • NUL strings consume their encoded byte length plus one 00 terminator.
  • Counted arrays repeat immediately in the order shown.