How to work with nssdb and certutil remove database rm -r ~/.pki/nssdb create database directory mkdir -p ~/.pki/nssdb list all certificates certutil -d sql:$HOME/.pki/nssdb -L list of hosts to get certificates from hosts="ip-of-squid-proxy1:443 ip-of-squid-proxy2:443" import each as trusted proxy for host in ${hosts}; do echo "" | openssl s_client -connect ${host} -prexit 2>/dev/null | sed -n -e '/BEGIN\ CERTIFICATE/,/END\ CERTIFICATE/ p' > "${host}.crt" certutil -d sql:$HOME/.pki/nssdb -A -t P,P,P -n "${host}" -i ${host}.crt rm ${host}.crt done show certificate certutil -L -d sql:$HOME/.pki/nssdb -n certname delete certutil -d sql:$HOME/.pki/nssdb -D -n certificate_nickname