I'm getting "ERR_TUNNEL_CONNECTION_FAILED" errors in Chrome when connecting to https://securefiles.laborberlin.com/ Squid logs: 1601906504.874 0 141.42.231.251 NONE_NONE/500 0 CONNECT securefiles.laborberlin.com:443 - HIER_NONE/- - accessRule=- - 1601906505.047 0 141.42.231.251 NONE_NONE/500 0 CONNECT securefiles.laborberlin.com:443 - HIER_NONE/- - accessRule=- - 1601906505.225 0 141.42.231.251 NONE_NONE/500 0 CONNECT securefiles.laborberlin.com:443 - HIER_NONE/- - accessRule=- - The squid process should be able to resolve the hostname... I explicitly set an dns_nameservers entry, like this: dns_nameservers 141.42.5.156 141.42.5.157 Testin on the squid machine: # dig +short @141.42.5.156 securefiles.laborberlin.com 607748248.dracoon.cloud. # dig +short @141.42.5.156 607748248.dracoon.cloud 213.95.134.242 # dig +short @141.42.5.157 securefiles.laborberlin.com 607748248.dracoon.cloud. # dig +short @141.42.5.157 607748248.dracoon.cloud 213.95.134.242 So what is the reason for the NONE_NONE/500 error? Ralf Hildebrandt Charité - Universitätsmedizin Berlin Geschäftsbereich IT | Abteilung Netzwerk Campus Benjamin Franklin (CBF) Haus I | 1. OG | Raum 105 Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 ralf.hildebrandt@xxxxxxxxxx https://www.charite.de _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users