ERROR com.tableausoftware.gateway.GatewayControl - Exception while installing process

Issue - Gateway Service Does not Start and Tableau Server is Degraded

Error - 

ERROR com.tableausoftware.gateway.GatewayControl - Exception while installing process.

com.tableausoftware.tabadmin.configuration.ports.UnableToFindAvailablePortException: Port 80 was already registered for port type gateway_0:primary but isn't available. Unable to remap port

at com.tableausoftware.tabadmin.configuration.ports.PortSelector.selectPort(PortSelector.java:121)

at com.tableausoftware.tabadmin.configuration.ports.ControlAppPortsHelper.selectPorts(ControlAppPortsHelper.java:110)

at com.tableausoftware.service.control.ControlServiceApp$Commands.install(ControlServiceApp.java:341)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at com.tableausoftware.commandline.SwitchCommand$1.run(SwitchCommand.java:193)

at com.tableausoftware.commandline.SimpleCommand.execute(SimpleCommand.java:47)

at com.tableausoftware.commandline.SwitchCommand.execute(SwitchCommand.java:148)

at com.tableausoftware.service.control.ControlServiceApp.execute(ControlServiceApp.java:144)

at com.tableausoftware.service.control.ControlServiceApp.executeCommandWithApp(ControlServiceApp.java:130)

at com.tableausoftware.gateway.GatewayControl.main(GatewayControl.java:79)

2021-06-10 13:18:10.629 -0700 13432 main : INFO  com.tableausoftware.gateway.GatewayControl - Executing command with args [[install]]

2021-06-10 13:18:10.743 -0700 13432 main : INFO  com.tableausoftware.gateway.GatewayControl - Installing gateway

Solution - 

Identified the gateway port 80 is being using Sophos anti virus, changed the default port to 8000

Stopped the Tableau services 

tsm topology set-ports -n node1 -pn gateway -pv 8000

tsm pending-changes apply​​​​​​

Started the Tableau services

Reference - https://kb.tableau.com/articles/Issue/tableau-server-ports-changed-to-8000-and-higher?_gl=1*1jthnyk*_ga*MTQwMTU3ODEyNi4xNjIzMzU2NjM2*_ga_8YLN0SNXVS*MTYyMzM2OTM2OS40LjEuMTYyMzM3MTQxOS4w&_ga=2.139797235.1526428993.1623356641-1401578126.1623356636