Alert when SSL certificate due for renewal

How many times has someone forgotten to renew an SSL certificate? Often it is because a previous admin has moved to another function. Here is a program that I wrote to check the ‘time to live’ of certificates on servers remotely using OpenSSL. Read the source code for details on how to call it. Download it here and put it in a daily cronjob that sends you e-mail if renewal time is near.

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