How to fix SMTP authen fail with error "curl_easy_perform: error(56)"
When SMTP authentication fails in Zimbra for every user and program, check the error log at /var/log/zimbra.log for an error like this: Jul 28 16:34:05 server saslauthd[33294]:
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Proxy.
3 articles on this topic
Proxy Auto Configuration (PAC) - Proxy auto-config
This may be familiar to many readers, but it was new to me: using a proxy for selected websites while connecting directly to others with proxy auto-configuration.
Transparent proxy in squid 2.6
Transparent proxy configuration changed in Squid version 2.6 onward. It uses http_port 3128 transparent instead of the older configuration with many lines, as shown below…