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RPC Proxy Authentication Setting: registry value proxyauthenticationserviceUserHKCU\software\policies\microsoft\office\16.0\outlook\rpc

Policy ID
L_RPCProxyAuthenticationSetting
Scope
User Configuration
Supported on
At least Windows Server 2008 R2 or Windows 7
Source
Microsoft 365 Apps / Office Administrative Templates (version 5568.1000)
Category
Microsoft Outlook 2016 › Account Settings › Exchange

Registry

proxyauthenticationservice

REG_DWORDUser
HKCU\software\policies\microsoft\office\16.0\outlook\rpc Current key
Enabled value
Depends on the option value
Element
Authentication used to connect with the proxy server:
Options
ItemStored value
Basic1
NTLM2
Negotiate16
Certificate65536
Apply with .reg · CMD · PowerShell
.reg
Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\rpc]

; Options (use only one)
; Basic
"proxyauthenticationservice"=dword:00000001
; NTLM
"proxyauthenticationservice"=dword:00000002
; Negotiate
"proxyauthenticationservice"=dword:00000010
; Certificate
"proxyauthenticationservice"=dword:00010000
CMD
:: Options (use only one)

:: Basic
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\rpc" /v "proxyauthenticationservice" /t REG_DWORD /d 1 /f
:: NTLM
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\rpc" /v "proxyauthenticationservice" /t REG_DWORD /d 2 /f
:: Negotiate
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\rpc" /v "proxyauthenticationservice" /t REG_DWORD /d 16 /f
:: Certificate
reg add "HKCU\software\policies\microsoft\office\16.0\outlook\rpc" /v "proxyauthenticationservice" /t REG_DWORD /d 65536 /f
PowerShell
# Common: create the key
New-Item -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\rpc' -Force | Out-Null

# Options (use only one)
# Basic
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\rpc' -Name 'proxyauthenticationservice' -PropertyType DWord -Value 1 -Force | Out-Null
# NTLM
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\rpc' -Name 'proxyauthenticationservice' -PropertyType DWord -Value 2 -Force | Out-Null
# Negotiate
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\rpc' -Name 'proxyauthenticationservice' -PropertyType DWord -Value 16 -Force | Out-Null
# Certificate
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\outlook\rpc' -Name 'proxyauthenticationservice' -PropertyType DWord -Value 65536 -Force | Out-Null