Windows setting Http2MaxSettingsPerMinute - counted per connection or server-wide?Windows Server 2012 R2 IIS...

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Windows setting Http2MaxSettingsPerMinute - counted per connection or server-wide?


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In article https://support.microsoft.com/en-us/help/4491420/define-thresholds-on-the-number-of-http-2-settings-parameters-exchange, Microsoft describes two new Windows registry settings to address an issue in which a malicious HTTP/2 client can send so many HTTP/2 SETTINGS parameters that the server runs out of CPU.



The description for the Http2MaxSettingsPerMinute registry setting is




If the number of settings parameters contained in multiple Settings frames received within a minute crosses "Http2MaxSettingsPerMinute" value, then connection is killed.




It's not clear to me whether this count ('number of settings parameters') is measured per connection, or across the entire server. That is, if I set the registry value for Http2MaxSettingsPerMinute to 100, and clients start 20 connections with 5 SETTINGS each in the period of a minute, will the 21st attempted connection within the minute be killed? Or would a connection only be killed if that single connection included the client sending over 100 SETTINGS within a minute?



thanks!



Martin









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    In article https://support.microsoft.com/en-us/help/4491420/define-thresholds-on-the-number-of-http-2-settings-parameters-exchange, Microsoft describes two new Windows registry settings to address an issue in which a malicious HTTP/2 client can send so many HTTP/2 SETTINGS parameters that the server runs out of CPU.



    The description for the Http2MaxSettingsPerMinute registry setting is




    If the number of settings parameters contained in multiple Settings frames received within a minute crosses "Http2MaxSettingsPerMinute" value, then connection is killed.




    It's not clear to me whether this count ('number of settings parameters') is measured per connection, or across the entire server. That is, if I set the registry value for Http2MaxSettingsPerMinute to 100, and clients start 20 connections with 5 SETTINGS each in the period of a minute, will the 21st attempted connection within the minute be killed? Or would a connection only be killed if that single connection included the client sending over 100 SETTINGS within a minute?



    thanks!



    Martin









    share

























      0












      0








      0








      In article https://support.microsoft.com/en-us/help/4491420/define-thresholds-on-the-number-of-http-2-settings-parameters-exchange, Microsoft describes two new Windows registry settings to address an issue in which a malicious HTTP/2 client can send so many HTTP/2 SETTINGS parameters that the server runs out of CPU.



      The description for the Http2MaxSettingsPerMinute registry setting is




      If the number of settings parameters contained in multiple Settings frames received within a minute crosses "Http2MaxSettingsPerMinute" value, then connection is killed.




      It's not clear to me whether this count ('number of settings parameters') is measured per connection, or across the entire server. That is, if I set the registry value for Http2MaxSettingsPerMinute to 100, and clients start 20 connections with 5 SETTINGS each in the period of a minute, will the 21st attempted connection within the minute be killed? Or would a connection only be killed if that single connection included the client sending over 100 SETTINGS within a minute?



      thanks!



      Martin









      share














      In article https://support.microsoft.com/en-us/help/4491420/define-thresholds-on-the-number-of-http-2-settings-parameters-exchange, Microsoft describes two new Windows registry settings to address an issue in which a malicious HTTP/2 client can send so many HTTP/2 SETTINGS parameters that the server runs out of CPU.



      The description for the Http2MaxSettingsPerMinute registry setting is




      If the number of settings parameters contained in multiple Settings frames received within a minute crosses "Http2MaxSettingsPerMinute" value, then connection is killed.




      It's not clear to me whether this count ('number of settings parameters') is measured per connection, or across the entire server. That is, if I set the registry value for Http2MaxSettingsPerMinute to 100, and clients start 20 connections with 5 SETTINGS each in the period of a minute, will the 21st attempted connection within the minute be killed? Or would a connection only be killed if that single connection included the client sending over 100 SETTINGS within a minute?



      thanks!



      Martin







      http2 iis-10





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