Tuesday, July 16, 2019

TLS handshake failure question

Good morning,

I have a server that performs daily file transfers to a vendor using HTTPS. The vendor recently updated their SSL certificate and now my server cannot complete a TLS handshake with it. I verified with my firewall team that the connection is allowed (as it was before), and even tried manually adding the certificates to my servers keystone (Windows). I'm a bit at a loss here. Wireshark stops logging packets after the Server Hello message (I can see where the certificate hex message starts but I'm not sure if it gets the whole thing). Eventually the request times out because the handshake never finishes.

Any help on this is appreciated!

Edit, here's a screenshot of the pcap https://content.spiceworksstatic.com/service.community/p/post_images/0000363641/5d260f57/attached_image/pcap.png



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