Packets/Login/Vanilla

It's worth noting that, for build  (1.1.2.4125), the client automatically disconnects after a successful login challenge and proof exchange and sends a reconnect packet right away instead of asking for the realm list.

Opcodes and Errors

See Login Packets. The opcode value corresponds to the packet name.

Error codes

Name	Value	Client Message
SUCCESS	0x00
FAIL_UNKNOWN0	0x01	"Unable to Connect"
FAIL_UNKNOWN1	0x02	"Unable to Connect"
FAIL_BANNED	0x03	"The World of Warcraft account has been closed and is no longer available for use. Please go to http://www.wow-europe.com/en/misc/banned.html for further information.
FAIL_UNKNOWN_ACCOUNT	0x04	"The information you have entered is not valid. Please check the spelling of the account name and password. If you need help in retrieving a lost or stolen password and account, see http://www.wow-europe.com for more information."
FAIL_INCORRECT_PASSWORD	0x05	"The information you have entered is not valid. Please check the spelling of the account name and password. If you need help in retrieving a lost or stolen password and account, see http://www.wow-europe.com for more information."
FAIL_ALREADY_ONLINE	0x06	"This account is already logged into World of Warcraft. Please check the spelling and try again."
FAIL_NO_TIME	0x07	"You have used up your prepaid time for this account. Please purchase more to continue playing."
FAIL_DB_BUSY	0x08	"Could not log in to World of Warcraft at this time. Please try again later."
FAIL_VERSION_INVALID	0x09	"Unable to validate game version. This may be caused by file corruption or the interference of another program. Please visit http://www.wow-europe.com/en/support/ for more information and possible solutions to this issue."
LOGIN_DOWNLOAD_FILE	0x0A	"Downloading"
FAIL_INVALID_SERVER	0x0B	"Unable to Connect"
FAIL_SUSPENDED	0x0C	"The World of Warcraft account has been temporarily suspended. Please go to http://www.wow-europe.com/en/misc/banned.html for further information.
FAIL_NO_ACCESS	0x0D	"Unable to Connect"
SUCCESS_SURVEY	0x0E	"Success!" Pressing cancel either shows a cached realmlist or "Retrieving realm list".
FAIL_PARENTALCONTROL	0x0F	"Access to this account has been blocked by parental controls. Your settings may be changed in your account preferences at http://www.worldofwarcraft.com."
FAIL_LOCKED_ENFORCED	0x10	Does not appear to be valid on 1.12.1.

Challenge packets

Client

See CMD_AUTH_LOGON_CHALLENGE_Client.

Server

See CMD_AUTH_LOGON_CHALLENGE_Server.

Proof packets

Client

See CMD_AUTH_LOGON_PROOF_Client.

Server

AuthLogonProof_Server

Offset	Size	Type	Name	Description
Header
0x0	1 / -	uint8	command	LOGIN_PROOF (0x1)
0x1	1 / -	uint8	error	The fields below are only included if this is LOGIN_OK (0x0).
Body
0x2	20 / Little	uint8[20]	m2	SRP6 Server proof.
0x16	4 / Little	uint32	hardware_survey_id	ID of a hardware survey that the client should perform. Set to 0 to not use. Can safely be set to 0.

Reconnection challenge packets

Client

The reconnect client packet has the same format as CMD_AUTH_LOGON_CHALLENGE_Client except that the opcode field is 0x2 instead of 0x0.

Server

See CMD_AUTH_RECONNECT_CHALLENGE_Server.

Reconnection proof packets

Client

See CMD_AUTH_RECONNECT_PROOF_Client.

To check if the client proof is correct, the server must calculate SHA1(account_name | proof_data | challenge_data | session_key) and compare it to client_proof.

Server

See CMD_AUTH_RECONNECT_PROOF_Server.

Realm list packets

Client

RealmList_Client

Offset	Size / Endianness	Type	Name	Description
0x0	1 / -	uint8	cmd	REALMLIST (0x10)
0x1	4 / -	uint32	unknown	Hardcoded to 0 in the client. Can be expected to always be 0.

Server

The server answers with a packet composed of a RealmHeader_Server, as many RealmInfo_Server as specified and a RealmFooter_Server.

Header

RealmHeader_Server

Offset	Size / Endianness	Type	Name	Description
0x0	1 / -	uint8	command	REALMLIST (0x10)
0x1	2 / Little	uint16	size	Size of the rest of packet, without the command and size fields (3 bytes).
0x3	4 / -	uint32	unknown	Not used in public clients. Set to 0.
0x7	1 / -	uint8	num_realms	Number of RealmInfo_Server.

The size value can be computed with the part of the header taken into account plus the footer (5+2 bytes) and the size of every RealmInfo_Server which is variable.

Body

RealmInfo_Server

Offset	Size / Endianness	Type	Name	Description
0x0	4 / Little	uint32	realm_type	0 is normal, 1 is PvP, 6 is RP and 8 is RPPvP.
0x4	1 / -	uint8	flags	See RealmInfo_Server.flags table below.
0x5	- / Big	char[]	realm_name	Zero terminated string; name of the Realm
	- / Big	char[]	address_port	Zero terminated string; address of the Realm ("ip:port")
	4 / Little	float	population	Population value. 200 is always green "Recommended", 400 is always red "Full", 600 is always blue "Recommended". Low/Medium/High are calculated based on the population values sent.
	1 / -	uint8	num_chars	The number of characters the client has on the server.
	1 / -	uint8	realm_category	The language or region of the server. How this is interpreted depends on the locale of the client. It is shown as tabs at the bottom of the realmlist screen. If there are only realms of one category no tabs are shown. See table RealmInfo_Server.realm_category Values.
	1 / -	uint8	realm_id	Used for the initial sorting of the realms. Identical values are not a problem.

RealmInfo_Server.flags Values

Value	Name	Description
0x00	NONE	No changes.
0x01	INVALID	Color realm name in read.
0x02	OFFLINE	Gray out name and prevent selection.
0x04	SPECIFY_BUILD	Unused. Possibly used to list realm build numbers previously.
0x08	UNK1	Unused.
0x10	UNK2	Unused.
0x20	FORCE_RECOMMENDED	Forces the client to show the server as "Recommended" in blue text, no matter what the population value is.
0x40	FORCE_NEW_PLAYERS	Forces the client to show the server as "Recommended" in green text, no matter what the population value is.
0x80	FORCE_FULL	Forces the client to show the population as "Full" in red text, no matter what the population value is.

RealmInfo_Server.realm_category Values

Value	Name	Description
0x00	DEFAULT	Same as the first value for a locale.
US
0x01	UNITED_STATES	United States.
0x05	OCEANIC	Oceania.
EUROPE
0x01	ENGLISH	English.
0x02	GERMAN	German.
0x03	FRENCH	French.
0x05	SPANISH	Spanish.
KOREA
0x01	KOREA	Korea.
TAIWAN
0x01	TAIWAN	Taiwan.
CHINA
0x01	CHINA	China.
0x02	CN3	Unknown.
0x03	CN7	Unknown.
TEST
0x01	TEST_SERVER	Test.
0x05	OCEANIC_TEST	Oceanic test.
QA
0x01	QA_SERVER	QA server.

Footer

RealmFooter_Server

Offset	Size / Endianness	Type	Name	Description
0x0	2 / ?	uint16	unknown	Ignored in public clients. Set to 0.