Hello Vieri, This article tries to explain why it happens. https://docs.diladele.com/faq/squid/fix_unable_to_get_issuer_cert_locally.html#ssl-certificate-test-tool-in-web-safety-5 To fix it - better use what Yuri recommended in http://squid-web-proxy-cache.1019090.n4.nabble.com/Howto-fix-X509-V-ERR-UNABLE-TO-GET-ISSUER-CERT-LOCALLY-Squid-error-td4682015.html Raf -----Original Message----- From: squid-users [mailto:squid-users-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Vieri Sent: Monday, May 29, 2017 2:36 PM To: squid-users@xxxxxxxxxxxxxxxxxxxxx Subject: squid sslbump and certificates Hi, When a client browser gets the Squid error page as shown below, what does it mean? Does it mean that Squid doesn't trust the CA mentioned below? If I wanted to allow the connection anyway, what options would I have? The system returned: (71) Protocol error (TLS code: X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) SSL Certficate error: certificate issuer (CA) not known: /C=US/O=GeoTrust, Inc./OU=Domain Validated SSL/CN=Secure Site Starter DV SSL CA - G2 Thanks, Vieri _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users