No Error 

0 

Request was processed without error 

LANGUAGE_NOT_SUPPORTED  

1 

For an AttrRqst or SrvRqst, there is data for the service type in the scope, but not in the language indicated.  

PARSE_ERROR  

2 

The message fails to obey SLP syntax. 

INVALID_REGISTRATION  

3 

The SrvReg has problems--for example, a zero lifetime or an omitted language tag  

SCOPE_NOT_SUPPORTED 

4 

The SLP message did not include a scope in its scope list that is supported by the SA or DA that answered the request.  

AUTHENTICATION_UNKNOWN 

5 

The DA or SA received a request for an unsupported SLP SPI.  

AUTHENTICATION_ABSENT 

6 

The UA or DA expected URL and attribute authentication in the SrvReg and did not receive it.  

AUTHENTICATION_FAILED 

7 

The UA or DA detected an authentication error in an Authentication block.  

VER_NOT_SUPPORTED 

9 

Unsupported version number in message 

INTERNAL_ERROR 

10 

An unknown error occurred in the DA or SA. For example, the operating system ran out of file space. 

DA_BUSY_NOW 

11 

The UA or SA should retry, using exponential back off. The DA is busy processing other messages. 

OPTION_NOT_UNDERSTOOD 

12 

The DA or SA received an unknown option from the mandatory range. 

INVALID_UPDATE 

13 

The DA received a SrvReg without FRESH set, for an unregistered service or with inconsistent service types. 

MSG_NOT_SUPPORTED 

14 

The SA received an AttrRqst or SrvTypeRqst and does not support it.  

REFRESH_REJECTED 

15 

The SA sent a SrvReg or partial SrvDereg to a DA more frequently than the DA's min-refresh-interval.