Set maximum Kerberos SSPI context token buffer size: registry value EnableMaxTokenSize and 1 moreComputerHKLM\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters

Policy ID: MaxTokenSize
Scope: Computer Configuration
Supported on: At least Windows Server 2003 operating systems or Windows XP Professional
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › Kerberos

Registry

EnableMaxTokenSize

REG_DWORDComputer

HKLM\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters Current key

Enabled value: 1
Disabled value: 0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters]

; Options (use only one)
; Enabled
"EnableMaxTokenSize"=dword:00000001
; Disabled
"EnableMaxTokenSize"=dword:00000000

CMD

:: Options (use only one)

:: Enabled
reg add "HKLM\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters" /v "EnableMaxTokenSize" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKLM\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters" /v "EnableMaxTokenSize" /t REG_DWORD /d 0 /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters' -Force | Out-Null

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters' -Name 'EnableMaxTokenSize' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters' -Name 'EnableMaxTokenSize' -PropertyType DWord -Value 0 -Force | Out-Null

MaxTokenSize

REG_DWORDComputer

HKLM\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters Current key

Enabled value: Depends on the option value
Element: Maximum size
Value type: REG_DWORD
Required: true
Minimum value: 12000
Maximum value: 2147483647

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"MaxTokenSize"=dword:<enter value>

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters" /v "MaxTokenSize" /t REG_DWORD /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Control\Lsa\Kerberos\Parameters' -Name 'MaxTokenSize' -PropertyType DWord -Value '<enter value>' -Force | Out-Null