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From Han Wiki

Juniper Pulse Secure client

  • Last tested on CentOS 7.7.1908 (2020-04-22)

First, get the CA certificate file to get rid of the following error:

Server certificate verify failed: signer not found

echo -n | openssl s_client -connect vpn.myuniversity.edu:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > ~/certs/myschool-vpn-cafile.crt

Then grab the --servercert sha256:whateverhexcodehere that shows up when you execute the following line:

$ sudo openconnect --authgroup=colleges --user=skan --cafile=/home/skan/certs/myschool-vpn-cafile.crt --juniper https://vpn.myuniversity.edu

Disconnect using ctrl-c and then add the --servercert param:

$ sudo openconnect --authgroup=colleges --user=skan --cafile=/home/skan/certs/myschool-vpn-cafile.crt --servercert sha256:043c3a132f34d87ba8c507f21d775a08dc1d85aa3f2d782996d66d17865af2e0 --juniper https://vpn.myuniversity.edu