![]() ![]() ![]() 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?Įven 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. O Changing InitialRTO from 3 Seconds to 1 second will help Windows 10 to send the encrypted SYN faster. 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. SIP client tries establish a new IPSec connection with SIP ServerĬonnect immediately after getting the Server Response, with new connection details.SIP server responds with “401 Unauthorized” with server details for establishing an IPSec connection.SIP Client sends REGISTER message with IPSec requirement to SIP server.The first TCP connection between SIP client to SIP server is established (3 way SYN handshake).SIP server always running on Windows 7, while SIP Client need to be upgraded from Windows 7 to Windows 10. I am testing scenario using SIP (Session Initiation Protocol) server and SIP client.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.Ī detailed step by step problem statement is provided below Obviously Windows 7 is not having InitalRTO TCP parameter and I am not sure how much is the defaultīeing set in Windows 7. 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. 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 am facing a strange issue with the TCP connection in Windows 10 compared with Windows 7. 3 Second Delay in TCP SYN for the IPSec in Windows 10 compared with Windows 7 ![]()
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