There are different methods for monitoring whether a server or a service running on a server is available.
Steps
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Select
Secure SD-WAN Configuration.
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Browse to Traffic Handlers.
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Right-click a Server Pool element, then select Properties.
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In the Frequency Check field on the Monitoring tab, define how often you want the availability to be checked.
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From the Method drop-down list, select the method for monitoring the availability of the servers in the Server Pool.
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(TCP or HTTP methods) Specify the additional options.
The text in the Request field is sent by the Engine in the first packet after the TCP handshake. The text in the Response field is
checked against the first data packet received from the server after the TCP handshake.
Tip: The response is evaluated using a begins with pattern. It is not necessary to enter the complete text of the response.
When using TCP, if the Request and Response fields are left empty, the Engine only checks that a connection can be established.
For example, to check for the HTTPS service, enter 443 as the port number, but leave the Request and Response fields empty. In
this case, the Engine only checks that a connection to port 443 can be established.
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Click OK.