#####################################################################
  testssl.sh version 3.2.3 from https://testssl.sh/
  (39d2400 2026-06-16 14:20:59)

  This program is free software. Distribution and modification under
  GPLv2 permitted. USAGE w/o ANY WARRANTY. USE IT AT YOUR OWN RISK!

  Please file bugs @ https://testssl.sh/bugs/
#####################################################################

  Using OpenSSL 1.0.2-bad (Mar 28 2025)  [~183 ciphers]
  on garie-ssllabs-6b94fc86bd-z4kzf:/opt/testssl.sh/bin/openssl.Linux.x86_64

 Start 2026-06-28 06:20:19        -->> 10.50.4.115:443 (demo-biodiversity.eea.europa.eu) <<--

 rDNS (10.50.4.115):     kvm-dev5-f01.pdmz.eea./usr/local/bin/testssl.sh: connect: Connection refused
/usr/local/bin/testssl.sh: line 12102: /dev/tcp/10.50.4.115/443: Connection refused
 Oops: TCP connect problem

Unable to open a socket to 10.50.4.115:443. 
Fatal error: Can't connect to "10.50.4.115:443"
Make sure a firewall is not between you and your scanning target!