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If you are getting an error using RDP to connect to a Windows Server and error say “Remote Desktop Connection: An authentication error has occurred.\u00a0 The function requested is not supported. This could be due to CredSSP encryption oracle remediation”, this is because you are connected from an unpatched client to a patched server or a patched client to an unpatched server.<\/p>\n
To fix this issue, install the May 2018 Windows Updates on both the server and the local PCs.<\/strong><\/p>\n Microsoft has been patching a vulnerability in RDP\/CREDSSP with the patches released this month (May 2018) and previous month or two, and as of the May 8 updates, it requires BOTH the client PCs and the Windows Server to both have the May patches installed.<\/p>\n Below is a link about it but best is to apply the patches\u2026. <\/p>\n UPDATED 5\/10\/2018 –<\/p>\n Additional links discussing this issue below.\u00a0 Best approach is just install Windows Updates on both Servers & Client\/local PCs\u00a0 and everything should work.\u00a0 If you are unable to patch your server immediately, there are some suggested workarounds (registy\/GPO modifications, disable NLA (not recommended due to lower security), etc.\u00a0 We strongly recommend you apply the May 2018 Windows Updates.<\/p>\n https:\/\/blogs.technet.microsoft.com\/askpfeplat\/2018\/05\/07\/credssp-rdp-and-raven\/<\/a><\/p>\n
\nhttps:\/\/blogs.technet.microsoft.com\/yongrhee\/2018\/05\/09\/after-may-2018-security-update-rdp-an-authentication-error-occurred-this-could-be-due-to-credssp-encryption-oracle-remediation\/<\/a><\/p>\n