TCP Port Availability service

The TPC Port Availability service, formerly called Generic TCP, monitors the connectivity of a socket on a specified port on a device and, if the port is available, a specific TCP service functioning on the port.

After the port has successfully passed the test for connectivity, the service can continue on to use an appropriate command string to test the TCP service it is monitoring and a validation string against which to check the response it receives. The availability results of the TCP service are then reflected on the status dashboard for the TCP port availability service. For example, the command string 201 receiving the appropriate response code 220 indicates that the FTP service is running and available for use. The service also measures the round trip time for the request and the DNS resolution.

You can set a maximum of six instances of the TCP port availability service on a device, with each instance monitoring a different port on the device.

The service does not use the Warning state.

Service Type	TCP port availability (Generic TCP)
Instances on a Device	10
Device Class	Server - Generic, Workstation - Generic, Other, Printer, Scanner/Camera, Switch/Router, Laptop - Windows, Server - Windows, and Workstation - Windows
Monitored By	Windows probe, Central Server
Scan Interval	5 minutes
Timeout Value	The time (in seconds) that the N-able N-central server waits before considering the test a failure. The default is 30 seconds.
Port Number	The TCP port number used to monitor the TCP port availability service.
Send Command String	A predefined set of characters specific to the TCP service. The string is transmitted upon connection to the host and requests the response about the TCP service.
Validation String	The response you expect to receive from the port that is being queried. If the validation string that you specify is not returned by the port being queried, the service will transition to a Failed state.

Status details

Status Detail	Description
Generic Service Availability	The threshold that determines the availability of the port.
Round Trip Time (ms)	The time for a request to be sent and received.
DNS Resolution	The threshold that determines whether the device name can be resolved. If an FQDN has been specified, the service searches for its IP address. If the IP address is found, the state will be Normal. Otherwise, it will be Failed, based on the default settings. If an IP address has been specified, the service checks only the IP address's format. If the format is correct, the state will be Normal. Otherwise, it will be Failed, based on the default settings.

Status Detail

Description

Generic Service Availability

The threshold that determines the availability of the port.

Round Trip Time (ms)

The time for a request to be sent and received.

DNS Resolution

The threshold that determines whether the device name can be resolved.

If an FQDN has been specified, the service searches for its IP address. If the IP address is found, the state will be Normal. Otherwise, it will be Failed, based on the default settings.

If an IP address has been specified, the service checks only the IP address's format. If the format is correct, the state will be Normal. Otherwise, it will be Failed, based on the default settings.