On remaining nodes, flush any cached references to the removed node:
To remove a Web Application Proxy (WAP) server from a cluster (or "farm"), you must update the cluster configuration to exclude the decommissioned server and then uninstall the Remote Access role from the server itself. 1. Update the Cluster Configuration remove web application proxy server from cluster
On an internal AD FS server, use PowerShell to forcibly remove the orphaned entry: On remaining nodes, flush any cached references to
Get-EventLog -LogName "AD FS/Admin" -EntryType Error | Select-Object -First 20 On remaining nodes
Successfully removed server 'WAP-03'.