EPP Response Codes

Positive Completion Replies

Code	Description
1000	Command completed successfully This is the usual response code for a successfully completed command that is not addressed by any other 1xxx-series response code.
1001	Command completed successfully; action pending This response code MUST be returned when responding to a command that requires offline activity before the requested action can be completed. See section 2 for a description of other processing requirements.
1300	Command completed successfully; no messages This response code MUST be returned when responding to a <poll> request command and the server message queue is empty.
1301	Command completed successfully; ack to dequeue This response code MUST be returned when responding to a <poll> request command and a message has been retrieved from the server message queue.
1500	Command completed successfully; ending session This response code MUST be returned when responding to a successful <logout> command.

Negative Completion Replies

Code	Description
2000	Unknown command This response code MUST be returned when a server receives a command element that is not defined by EPP.
2001	Command syntax error This response code MUST be returned when a server receives an improperly formed command element.
2002	Command use error This response code MUST be returned when a server receives a properly formed command element, but the command can not be executed due to a sequencing or context error. For example, a <logout> command can not be executed without having first completed a <login> command.
2003	Required parameter missing This response code MUST be returned when a server receives a command for which a required parameter value has not been provided.
2004	Parameter value range error This response code MUST be returned when a server receives a command parameter whose value is outside the range of values specified by the protocol. The error value SHOULD be returned via a <value> element in the EPP response.
2005	Parameter value syntax error This response code MUST be returned when a server receives a command containing a parameter whose value is improperly formed. The error value SHOULD be returned via a <value> element in the EPP response.
2100	Unimplemented protocol version This response code MUST be returned when a server receives a command element specifying a protocol version that is not implemented by the server.
2101	Unimplemented command This response code MUST be returned when a server receives a valid EPP command element that is not implemented by the server. For example, a <transfer> command can be unimplemented for certain object types.
2102	Unimplemented option This response code MUST be returned when a server receives a valid EPP command element that contains a protocol option that is not implemented by the server.
2103	Unimplemented extension This response code MUST be returned when a server receives a valid EPP command element that contains a protocol command extension that is not implemented by the server.
2104	Billing failure This response code MUST be returned when a server attempts to execute a billable operation and the command can not be completed due to a client billing failure.
2105	Object is not eligible for renewal This response code MUST be returned when a client attempts to <renew> an object that is not eligible for renewal in accordance with server policy.
2106	Object is not eligible for transfer This response code MUST be returned when a client attempts to <transfer> an object that is not eligible for transfer in accordance with server policy.
2200	Authentication error This response code MUST be returned when a server notes an error when validating client credentials.
2201	Authorization error This response code MUST be returned when a server notes a client authorization error when executing a command. This error is used to note that a client lacks privileges to execute the requested command.
2202	Invalid authorization information This response code MUST be returned when a server receives invalid command authorization information required to confirm authorization to execute a command. This error is used to note that a client has the privileges required to execute the requested command, but the authorization information provided by the client does not match the authorization information archived by the server.
2300	Object pending transfer This response code MUST be returned when a server receives a command to transfer an object that is pending transfer due to an earlier transfer request.
2301	Object not pending transfer This response code MUST be returned when a server receives a command to confirm, reject, or cancel the transfer of an object when no command has been made to transfer the object.
2302	Object exists This response code MUST be returned when a server receives a command to create an object that already exists in the repository.
2303	Object does not exist This response code MUST be returned when a server receives a command to query or transform an object that does not exist in the repository.
2304	Object status prohibits operation This response code MUST be returned when a server receives a command to transform an object that can not be completed due to server policy or business practices. For example, a server can disallow <transfer> commands under terms and conditions that are matters of local policy, or the server might have received a <delete> command for an object whose status prohibits deletion.
2305	Object association prohibits operation This response code MUST be returned when a server receives a command to transform an object that can not be completed due to dependencies on other objects that are associated with the target object. For example, a server can disallow <delete> commands while an object has active associations with other objects.
2306	Parameter value policy error This response code MUST be returned when a server receives a command containing a parameter value that is syntactically valid, but semantically invalid due to local policy. For example, the server can support a subset of a range of valid protocol parameter values. The error value SHOULD be returned via a <value> element in the EPP response.
2307	Unimplemented object service This response code MUST be returned when a server receives a command to operate on an object service that is not supported by the server.
2308	Data management policy violation This response code MUST be returned when a server receives a command whose execution results in a violation of server data management policies. For example, removing all attribute values or object associations from an object might be a violation of a server’s data management policies.
2400	Command failed This response code MUST be returned when a server is unable to execute a command due to an internal server error that is not related to the protocol. The failure can be transient. The server MUST keep any ongoing session active.
2500	Command failed; server closing connection This response code MUST be returned when a server receives a command that can not be completed due to an internal server error that is not related to the protocol. The failure is not transient, and will cause other commands to fail as well. The server MUST end the active session and close the existing connection.
2501	Authentication error; server closing connection This response code MUST be returned when a server notes an error when validating client credentials and a server-defined limit on the number of allowable failures has been exceeded. The server MUST close the existing connection.
2502	Session limit exceeded; server closing connection This response code MUST be returned when a server receives a <login> command, and the command can not be completed because the client has exceeded a system-defined limit on the number of sessions that the client can establish. It might be possible to establish a session by ending existing unused sessions and closing inactive connections.