You may notice webplayer service failure in admin console UI after upgrading to 11.5.0 and above versions. The following errors are seen in nm.log:

INFO 2021-11-09T14:32:11,611-0500 [b36f972a-5a2f-40a6-bb1d-f7ba2d654a72] nodemanager.control.ServiceConfigCommandHandler: Announcing service instance: 478f78ba-7db0-4984-9249-00266603535d status STARTING
INFO 2021-11-09T14:32:11,611-0500 [b36f972a-5a2f-40a6-bb1d-f7ba2d654a72] nodemanager.control.ServiceConfigCommandHandler: Announcing installation: Web Player 11.5.0
ERROR 2021-11-09T14:32:12,080-0500 [] server.nodemanager.ServiceMonitor: (FAILED) Process 478f78ba-7db0-4984-9249-00266603535d notified. Next Status STARTING
INFO 2021-11-09T14:32:12,080-0500 [] server.nodemanager.ServiceMonitor: Notifying about service: 478f78ba-7db0-4984-9249-00266603535d in state FAILED/STARTING. Last status message: Exited while initializing. Recent Logs: 11/09/2021 14:32:12 -  TIBCO Spotfire 11.5 and later requires .NET 4.8. Install Microsoft .NET Framework 4.8 and try again.

INFO 2021-11-09T14:32:12,080-0500 [] nodemanager.service.AbstractServiceManager: Determining if the service 478f78ba-7db0-4984-9249-00266603535d should restart (attempt #1, startedCount=0). Last exit code was ERRORSTARTUP
INFO 2021-11-09T14:32:12,080-0500 [] service.strategy.ServiceStrategy: Service 478f78ba-7db0-4984-9249-00266603535d will not be restarted. It has been 0 seconds since startup which is less than the threshold of 30 seconds
INFO 2021-11-09T14:32:12,080-0500 [] nodemanager.service.AbstractServiceManager: Service 478f78ba-7db0-4984-9249-00266603535d should not be restarted: Last exit message: ERRORSTARTUP 
ERROR 2021-11-09T14:32:12,080-0500 [] server.nodemanager.ServiceMonitor: The service [WEB_PLAYER]:478f78ba-7db0-4984-9249-00266603535d exited and will not be restarted.
INFO 2021-11-09T14:32:12,830-0500 [] nodemanager.remote.PropertiesManagerMonitor: Received ENTRY_MODIFY event for C:\tibco\tsnm\11.5.0\nm\config\config.json
INFO 2021-11-09T14:32:12,877-0500 [6d1f0926-5918-4ad7-8801-d7827438354b] nodemanager.control.ServiceManipulator: All services [478f78ba-7db0-4984-9249-00266603535d] have reported status beyond STARTING
INFO 2021-11-09T14:32:12,877-0500 [3b0176c4-476f-4b6a-9bfd-4c883a87da02] nodemanager.control.ServiceConfigCommandHandler: Received IDENTIFY_SERVICES from Node [serverId=ddae5576-9593-40c4-a1e5-8823e6767421, serverName=na1devsptpc201.dev.tibco.com, port=9443, siteID=5c2c7b84-e1f4-4187-9799-85a2a48f0ebc]. Command GUID: 3b0176c4-476f-4b6a-9bfd-4c883a87da02  Originated by StartServiceCommandHandler
INFO 2021-11-09T14:32:12,877-0500 [3b0176c4-476f-4b6a-9bfd-4c883a87da02] nodemanager.control.ServiceConfigCommandHandler: Announcing to supervisor 2 service configurations
INFO 2021-11-09T14:32:12,877-0500 [3b0176c4-476f-4b6a-9bfd-4c883a87da02] nodemanager.control.ServiceConfigCommandHandler: Announcing service instance: 478f78ba-7db0-4984-9249-00266603535d status FAILED
INFO 2021-11-09T14:32:12,877-0500 [3b0176c4-476f-4b6a-9bfd-4c883a87da02] nodemanager.control.ServiceConfigCommandHandler: Announcing installation: Web Player 11.5.0
WARN 2021-11-09T14:32:12,877-0500 [6d1f0926-5918-4ad7-8801-d7827438354b] nodemanager.control.DeployCommandHandler: Could not startup service based on {"@class":"com.spotfire.server.nodemanager.domain.ServiceInstanceConfiguration","status":"UNCONFIGURED","name":"Web Player","id":"478f78ba-7db0-4984-9249-00266603535d","serviceType":"SERVICE_INSTANCE","host":null,"version":"11.5.0","nextStatus":"STARTING","onStopStatus":"RESTART","startupCommand":"Spotfire.Dxp.Worker.Host.exe -tssUrl $tssUrl$ -baseUrl https://$host$:$port$/$serviceId$/ -enabledCapabilities $enabledCapabilities$ -serviceId $serviceId$ -certificatePath $certificatePath$ -registrationPort $registrationPort$","restartOnStop":true,"startOnStartup":true,"externallyManaged":false,"externallyStarted":false,"serviceManager":"com.spotfire.server.nodemanager.service.WorkerhostServiceManager","configuration":{"centralizedConfigId":"88f2e912-3635-4c7f-acf2-739c15bfdf24","targetFramework":"NETFRAMEWORK","port":"9501","enabledCapabilities":"WEB_PLAYER"},"environment":null,"capabilities":["WEB_PLAYER"],"workingDirectory":"WebWorker-52.0.16415.4853-0beffa33-fe7f-4b57-aaaa-60f610559399","deploymentArea":"191651f9-5e8f-49de-9ef7-43e42fb852b8","bundleVersion":"52.0.16415.4853","replacedById":null,"nodeId":null,"serviceConfigName":null,"versionHash":null,"technicalVersion":null,"lastMessage":null,"serviceURI":"https:/478f78ba-7db0-4984-9249-00266603535d"}
ERROR 2021-11-09T14:32:16,611-0500 [service-478f78ba-7db0-4984-9249-00266603535d-startup] service.monitor.ServiceStatusCallable: Max attempts to check the service 478f78ba-7db0-4984-9249-00266603535d has occurred. Shutting down the service.
INFO 2021-11-09T14:32:16,611-0500 [service-478f78ba-7db0-4984-9249-00266603535d-startup] nodemanager.service.AbstractServiceManager: Service ID 478f78ba-7db0-4984-9249-00266603535d is in a failing state Could not retrieve information from the service. Check that the port is accessible.. Shutdown lock aquired? true
ERROR 2021-11-09T14:32:16,611-0500 [] server.nodemanager.ServiceMonitor: (FAILED) Process 478f78ba-7db0-4984-9249-00266603535d notified. Next Status FAILED
INFO 2021-11-09T14:32:16,611-0500 [] server.nodemanager.ServiceMonitor: Notifying about service: 478f78ba-7db0-4984-9249-00266603535d in state FAILED/FAILED. Last status message: Exited while initializing. Recent Logs: 11/09/2021 14:32:12 -  TIBCO Spotfire 11.5 and later requires .NET 4.8. Install Microsoft .NET Framework 4.8 and try again.

INFO 2021-11-09T14:32:16,611-0500 [] nodemanager.service.AbstractServiceManager: Determining if the service 478f78ba-7db0-4984-9249-00266603535d should restart (attempt #1, startedCount=0). Last exit code was ERRORSTARTUP
INFO 2021-11-09T14:32:16,611-0500 [] service.strategy.ServiceStrategy: Service 478f78ba-7db0-4984-9249-00266603535d will not be restarted. It has been 4 seconds since startup which is less than the threshold of 30 seconds
INFO 2021-11-09T14:32:16,611-0500 [] nodemanager.service.AbstractServiceManager: Service 478f78ba-7db0-4984-9249-00266603535d should not be restarted: Last exit message: ERRORSTARTUP 
INFO 2021-11-09T14:32:16,611-0500 [] nodemanager.service.AbstractServiceManager: Could not find the tool for 478f78ba-7db0-4984-9249-00266603535d (C:\tibco\tsnm\11.5.0\nm\/services\WebWorker-52.0.16415.4853-0beffa33-fe7f-4b57-aaaa-60f610559399/Tools/workershutdown.bat)
INFO 2021-11-09T14:39:12,941-0500 [*Shutdown*] server.nodemanager.NodeManager: Node Manager shutting down...

• https://dotnet.microsoft.com/download/dotnet-framework/thank-you/net48-web-installer

• https://docs.tibco.com/pub/spotfire/general/sr/GUID-9D7EE31D-BA4A-4913-BD03-5ABD60EB1991.html