Type of check to perform. Negotiate sends a request and matches a
receive string. Connect only attemts to make a TCP/IP connection, thus
the the request and receive strings may be omitted. If checktype is a
number then negotiate and connect is combined so that after each N con-
nect attempts one negotiate attempt is performed. This is useful to
check often if a service answers and in much longer intervalls a nego-
tiating check is done. Off means no checking will take place and no
real or fallback servers will be activated. Default is negotiate.
[/quote]