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Hello, Did you check big_endian & little_endian format ? Some more info there: https://github.com/Warkdev/JaNGOSRealm/blob/master/src/main/java/eu/jangos/realm/network/packet/server/character/SMSG_CHAR_ENUM.java#L178 Tal'

I'm trying to send SMSG_CHAR_ENUM packet (example below): 1. Character data data = pack( '<Q{name_len}s3B5BB2I3f2IB3IIBI'.format(name_len = len(name_bytes)), 1, # guid name_bytes, # 'Name' + '\x00' 4, # race 11, # class id 0, # gender 0, # skin 0, # face 0, # hair style 0, # hair color 0, # facial hair 61, # level 141, # zone id 1, # map id 10322.1, # x 825.436, # y 1326.37, # z 0, # guild 0, # char flags ? 0, # first login 0, # pet display id 0, # pet level 0, # pet family 0, # first bag inventory id 0, # first bag inventory type 0 # enchant ? ) 2. Full packet: packet = pack('<B', num_chars) + data But client returns 'Error retrieving character list'. What am I doing wrong ?

Wonderful, you find issue and root cause at the same time! 

Solved! The opcode is 55 (0x037) = CMSG_CHAR_ENUM. Answering own question: in client request (b'\x00\x047\x00\x00\x00\x18\xb7\xce\xa7/Y\xff\xff\xff\xff') the first 2 bytes = packet size, next 4 bytes = opcode, so 7\x00\x00\x00 is opcode here, which equals to 55 after translating into integer.

After success SMSG_AUTH_RESPONSE client sends packet, after decryption it equals to b'\x00\x047\x00\x00\x00\x18\xb7\xce\xa7/Y\xff\xff\xff\xff', What is the client packet structure ? First two bytes are opcode, aren't it ? But if so, I can't find this opcode in list. Maybe I'm doing something wrong ? This is my enc/decrypt code: def encrypt(self, data): assert len(data) >= HeaderCrypt.ENCRYPT_HEADER_SIZE encrypted_header = [0] * HeaderCrypt.ENCRYPT_HEADER_SIZE for index in range(HeaderCrypt.ENCRYPT_HEADER_SIZE): enc = (data[index] ^ self.crypt_key[self.send_i]) + self.send_j enc %= 0x100 encrypted_header[index] = self.send_j = enc self.send_i = (self.send_i + 1) % len(self.crypt_key) return bytes(encrypted_header) + data[HeaderCrypt.ENCRYPT_HEADER_SIZE:] def decrypt(self, data): assert len(data) >= HeaderCrypt.DECRYPT_HEADER_SIZE decrypted_header = [0] * HeaderCrypt.DECRYPT_HEADER_SIZE for index in range(self.DECRYPT_HEADER_SIZE): dec = (data[index] - self.recv_j) ^ self.crypt_key[self.recv_i] dec %= 0x100 decrypted_header[index] = dec self.recv_j = data[index] self.recv_i = (self.recv_i + 1) % len(self.crypt_key) return bytes(decrypted_header) + data[HeaderCrypt.DECRYPT_HEADER_SIZE:] Encryption works fine (because I can send SMSG_AUTH_RESPONSE and go to Character list loading), but I'm not sure about decryption. So, the question - what is the CMSG_* packets structure and what packet client send under 0x047 opcode after SMSG_AUTH_RESPONSE ?