Ran into the same issue during our installation(events 391 and 422 on proxy and event 276 on the adfs server)Turned out it was caused by our security policy, which disables several ciphers and protocolsIn particular it was caused by disabling renegotiatingKey HKEYLOCALMACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELOn the proxy server DisableRenegoOnClient = 0 (or remove entry)On the ADFS server DisableRenegoOnClient = 0 (or remove) and DisableRenegoOnServer = 0 (or remove)Once that was done connecting the proxy to the farm went fine. We had the exact same issue, but it wasn't caused by this. We actually didn't have those keys at all on our ADFS server.What fixed it for us was a combination of installing hotfix KB3020773 on the adfs server and proxy, and changing a registry key.HKEYLOCALMACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELSendTrustedIssuerList from 1 to 0, and then rebooting the ADFS server.After that I went through the wap config wizard no problem. Hope this helps someone else. I banged my head for days on this.
Adfs Proxy Certificate
The federation server proxy was unable to complete a request to the Federation Service at address '%1' because of a time-out. This might mean that the Federation Service is currently unavailable. User Action Verify that the Federation Service is running. 223: ClaimDescriptionReloadError: Claim description could not be loaded correctly from the database.
Adfs Unable To Retrieve Proxy Configuration Data From The Federation Server
Exception details:System.Net.WebException: The remote server returned an error: (426) Upgrade Required.at System.Net.HttpWebRequest.GetResponseat Microsoft.IdentityServer.Management.Proxy.StsConfigurationProvider.GetStsProxyConfigurationIt seems like maybe I can't use a 2012 proxy.Have you tried to reinstall the WAP-role after upgrade of ADFS to server 2016?In general I would like to recommend to use the same version on both proxy and internal adfs-server.But remember you also need to prepare/raise AD for be able to use all new features.