AUTH_FAILED   

This is the server error reply for for cli_ident packet. It contain authorization error code (see list bellow). It always come from FLAP channel 0x04. See also channel 0x01 authorization sequence info. Here is known authorization error codes list:

  0x0001   Bad uin number
  0x0004   Password incorrect, re-enter
  0x0005   Password incorrect, re-enter
  0x0007   This ICQ# does not exist
  0x0008   This ICQ# does not exist
  0x0016   The users num connected from this IP has reached the maximum
  0x0017   The users num connected from this IP has reached the maximum
  0x0018   Rate limit exceeded. Please try to reconnect in a few minutes
  0x001B   You are using an older version of ICQ. Please upgrade
  0x001C   You are using an older version of ICQ. Please upgrade
  0x001D   Rate limit exceeded. Please try to reconnect in a few minutes
  0x001E   Can't register on the ICQ network. Reconnect in a few minutes

 00 01   word   TLV.Type(0x01) - screen name (uin)
 xx xx   word   TLV.Length
 xx ..   string   Screen name (uin)
 00 08   word   TLV.Type(0x08) - authorization error
 00 02   word   TLV.Length
 xx xx   word   Authorization error code (see above)
 00 0C   word   TLV.Type(0x0C) - unknown
 00 02   word   TLV.Length
 xx xx   word   unknown field

Example SNAC dump with flap header: 

  2A 04 C3 2C 00 16 00 01 00 06 37 37 37 37 37 37 *..,......777777
  00 08 00 02 00 05 00 0C 00 02 00 01             ............

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