Validation of chained certificates
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sstpc --user dummy --password pass --log-level 4 --log-stderr --ca-cert /etc/ss/certs/UTN_USERFirst_Hardware_Root_CA.pem vpn.umons.ac.be
The certificate validation fails with the following message:
SSL certificate verification failed: unable to get local issuer certificate (-20)
Verification of server certificate failed, (-2)
Using openssl validates the certificate fine.