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Currently, the directors check port 25 on each machine to see if postfix is running. This is bad, since it means we can't nolvs a machine and prevent it from also handling mail. Mitch wrote patches a few years ago that use the nagios ldap check and provide the smtp service that heartbeat can ping. This allows us to nolvs a machine and have it drop out of all services, meaning we can temporarily take a wedged machine out of the pool for debugging.

davidben points out that ​Chrome will be degrading SHA-1 certificates valid past 2016-01-01:

The following changes to Chromium's handling of SHA-1 are proposed:

• All SHA-1-using certificates that are valid AFTER 2017/1/1 are treated insecure, but without an interstitial. That is, they will receive a degraded UI indicator, but users will NOT be directed to click through an error page.
• Additionally, the mixed content blocker will be taught to treat these as mixed content, which WILL require a user action to interact with.
• All SHA-1-using certificates that are valid AFTER 2016/1/1 are treated as insecure, but without an interstitial. They will receive a degraded UI indicator, but will NOT be treated as mixed content.

This seems to include all certificates that mitcert/InCommon has issued (and continues to issue!) since 2013-01-01, since they have a three year expiration date.

So we’re going to need to replace all these certificates soon. This might also be a good excuse to move to a 2048-bit private key (because a 4096-bit certificate signed by 2048-bit CAs provides no security benefit and is noticeably slower).

Keeping private issues in memory and secret zephyr classes is lossy. We should set up a private Trac or add a plugin to the existing Trac that lets us keep private tickets.