Fix NONE/503 errors in Squid proxy

Author: cityofships

etc/kayobe/containers/squid_proxy/squid.conf

@@ -77,3 +77,7 @@ refresh_pattern ^ftp:		1440	20%	10080
 refresh_pattern ^gopher:	1440	0%	1440
 refresh_pattern -i (/cgi-bin/|\?) 0	0%	0
 refresh_pattern .		0	20%	4320
+
+# Disable connections over IPv6
+# https://ramesh-sahoo.medium.com/squid-proxy-server-has-stopped-handling-connection-resulting-in-none-503-0-connect-errors-55477316850a
+dns_v4_first on