Windows 10: 3 Second Delay in TCP SYN for the IPSec in Windows 10 compared with Windows 7

Discus and support 3 Second Delay in TCP SYN for the IPSec in Windows 10 compared with Windows 7 in Windows 10 Network and Sharing to solve the problem; Hi, I am facing a strange issue with the TCP connection in Windows 10 compared with Windows 7. I am observing a delay of 3 seconds while establishing... Discussion in 'Windows 10 Network and Sharing' started by SusRaj, Dec 6, 2018.

  1. SusRaj Win User

    3 Second Delay in TCP SYN for the IPSec in Windows 10 compared with Windows 7


    Hi,

    I am facing a strange issue with the TCP connection in Windows 10 compared with Windows 7. I am observing a delay of 3 seconds while establishing an IPSec connection in Windows 10, while in Windows 7, the connection is established in milliseconds. I was surprised to see that the changing the InitialRTO from 3 seconds to 1 second reduced the connection establishment time from 3 seonds to 1 second in Windows 10. Obviously Windows 7 is not having InitalRTO TCP parameter and I am not sure how much is the default being set in Windows 7. So, my issues is, the extra delay in Windows 10 is causing problems in existing scripts and need the reason for the delay being introduced in the Windows 10.



    A detailed step by step problem statement is provided below;

    · I am testing scenario using SIP (Session Initiation Protocol) server and SIP client. SIP server always running on Windows 7, while SIP Client need to be upgraded from Windows 7 to Windows 10.

    · The first TCP connection between SIP client to SIP server is established (3 way SYN handshake)

    · SIP Client sends REGISTER message with IPSec requirement to SIP server.

    · SIP server responds with “401 Unauthorized” with server details for establishing an IPSec connection

    · SIP client tries establish a new IPSec connection with SIP Server

    o My code calls the connect immediately after getting the Server Response, with new connection details.

    o The first Encrypted packet SYN to server is sent by the Windows only after 3 Seconds in Windows 10, while the same SYN is sent out within few milliseconds in Windows 7.

    o Changing InitialRTO from 3 Seconds to 1 second will help Windows 10 to send the encrypted SYN faster.

    I would like to know why this delay is introduced in Windows 10? Why changing the Initial RTO from 3 Seconds to 1 Second, changes the time required to send a SYN?



    Even though the RFC 6298 asks to change the Intial RTO to 1 second from the old 3 seconds, why Windows 10 is keeping the same in 3 seconds.



    Thanks

    Susanth


    see the packets 3045, 3046 and 3078


    3 Second Delay in TCP SYN for the IPSec in Windows 10 compared with Windows 7 347a107b-6358-438d-814e-77f9015b9574?upload=true.jpg

    :)
     
    SusRaj, Dec 6, 2018
    #1
  2. Ahhzz Win User

    Windows 10 Tweaks

    Pressing “Windows+Pause Break” (it’s up there next to scroll lock) opens the “System” Window.

    Windows 10: In the new version of Windows, Explorer has a section called Quick Access. This includes your frequent folders and recent files. Explorer defaults to opening this page when you open a new window. If you’d rather open the usual This PC, with links to your drives and library folders, follow these steps:

    • Open a new Explorer window.
    • Click View in the ribbon.
    • Click Options.
    • Under General, next to “Open File Explorer to:” choose “This PC.”
    • Click OK


    credit to Lifehacker.
     
    Ahhzz, Dec 6, 2018
    #2
  3. Installing Windows 10 using Windows 7 key

    Nope, you need to install Windows 10 first and make sure the Windows 7 key is transferred to your Windows account after you've installed Windows 10 (not quite sure how that works). I missed the last step and I could not activate Windows 10 after a re-install... Microsoft seem to have done everything they can to make it a PITA. Also, it's technically too late to do this now anyhow, as the upgrade offer has expired. But KMSPico works quite well...

    As for getting rid of Windows, delete the Windows folder.
     
    TheLostSwede, Dec 6, 2018
    #3
  4. 3 Second Delay in TCP SYN for the IPSec in Windows 10 compared with Windows 7

    Windows 10 Snipping Tool on Windows 7

    All it is is one extra step beyond what is native to windows 10. Yes, technically it would be easier to have the functionality of print built in to the Windows 7 version, but you just have to save it ,and right click on it ,and print.

    As far as getting the windows 10 version into windows7. I know there was a way to get the old winpaint, so maybe there's a way to get the snipping tool into 10, I don't know.

    im curious if i could compress, and upload the application to this post? 7zip doesnt seem to be allowed
     
    jboydgolfer, Dec 6, 2018
    #4
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3 Second Delay in TCP SYN for the IPSec in Windows 10 compared with Windows 7

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