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Help to understand: why webApp sending packets via TLSv1 insteatd of TLSv1.3?

wireshark dump I have problem to linking whatsapp desktop app on Windows 11. On step of linking after QR-code, App trying to load chats via SSL. Normally App connecting via TLSv1.3. Can you answer where I need to look for a problem, on PC TSL 1.0 and v1.1 are turned off. Is it problem on Cisco router or Firewall? linking whatsapp

Ericklans's avatar
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Ericklans
asked 2023-02-17 09:09:39 +0000, updated 2023-02-17 09:11:14 +0000
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Links for my pics:

https://ibb.co/p35QWCK

https://ibb.co/brr4Lrk

Ericklans's avatar Ericklans (2023-02-17 09:12:39 +0000) edit
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Please check details of the packet. That is what is proposed by the client. The question WHY is not something Wireshark will be know. That is up to the application and it's config.

hugo.vanderkooij's avatar
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hugo.vanderkooij
answered 2023-02-17 09:46:03 +0000
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  1. issued connection by Ethernet adapter with Firewall - https://imgtr.ee/i/OiQSL
  2. details of TLSv1 line - https://imgtr.ee/i/OiTA0
  3. retransmitting issue - https://imgtr.ee/i/OiYzF
  4. reset, ack - https://imgtr.ee/i/Oimam

also I've tried via WiFi-adapter (another internet without Firewall) - https://imgtr.ee/i/OirFB where watsapp is working with no problems

Ericklans's avatar Ericklans (2023-02-17 11:09:50 +0000) edit
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