cannot access certain websites

asked 2018-01-16 19:06:47 +0000

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The title says it all. To be specific, I cannot access and the tor project website. I keep getting a loading page. All other websites work fine. I recorded the traffic for 1 minute while the website ( was loading. It says I need 60 points to upload the pcapng file so I might not be able to do so.

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Publish your file, login-free, at cloudshark or any plain file-sharing service and edit your question with a link to it.

sindy gravatar imagesindy ( 2018-01-16 19:16:22 +0000 )edit

Okay, will do

moe gravatar imagemoe ( 2018-01-16 19:20:32 +0000 )edit

Things I see in the capture file:

  • The client 192.168.100 is able to establish a TCP connection to ( on port 443
  • Client tries to establish a TLS 1.2 session by sending a ClientHello record
  • ClientHello packet has not been acknowledged by server => There are retransmits from the client und duplicate ACKs from there server for the handshake ACK

Possible reasons: I can only speculate. Maybe a middle box which can't handle the TLS1.2 ClientHello packet.

Things you can try for testing:

  • disable HTTP/2 in your browser
  • disable TLS1.2 and use TLS1.0 or TLS1.1
Uli gravatar imageUli ( 2018-01-16 20:40:31 +0000 )edit

How do I disable TLS1.0/1.1 and HTTP/2 in firefox?

moe gravatar imagemoe ( 2018-01-16 21:32:06 +0000 )edit