here, look at this function at sobeit:

http://puu.sh/3TJ20

now look at this function at samp dll:

timing out(losting connection):

http://puu.sh/3TIxH

http://puu.sh/3TICF

leaving:

http://puu.sh/3TISt

so, dec: 500(hex: 0x01F4) will corectly close connection, any other value(default is 0) will timeout the connection.