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2008-12-12T02:56:53.947
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2008-12-12T02:56:53.947
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<p>How about we turn it into a programming question! You could use this code (C#), though I would recommend modifying it a bit (e.g. put url's in a file) and throwing it into a service.</p> <p>This code sets up a certificate validation callback which the HttpWebRequest will call anytime it encounters a certificate. This lets us take a look at the certificate, usually this is used to validate the cert but we are going to look at the expiration time and if it within 3 months we will send an email to ourselves. A timer is setup to run the check once a day.</p> <pre><code>using System.Net; using System.Diagnostics; using System.Net.Mail; using System.Threading; static void Main(string[] args) { // List of URL's to check string[] urls = new string[]{ "https://www.6bit.com/", "https://www.google.com/" }; HttpWebRequest req = null; // Certificate check callback ServicePointManager.ServerCertificateValidationCallback = (state, cert, certChain, sslerr) => { DateTime expiration = DateTime.Parse(cert.GetExpirationDateString()); if (expiration < DateTime.Now.AddMonths(3)) { Debug.WriteLine("Cert expiring on " + expiration.ToShortDateString()); MailMessage msg = new MailMessage("SSLCheck@example.com", "josh@example.com", "SSL Certificate Expiring", "The ssl certificate for" + req.RequestUri.ToString() + " will expire on " + expiration.ToShortDateString()); SmtpClient sc = new SmtpClient(); sc.Send(msg); } return true; }; // Request each url once a day so that the validation callback runs for each Timer t = new Timer(s => { Array.ForEach(urls, url => { try { req = (HttpWebRequest)HttpWebRequest.Create(url); HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); resp.Close(); } catch (Exception ex) { Debug.WriteLine("Error checking site: " + ex.ToString()); } }); }, null, TimeSpan.FromSeconds(0), TimeSpan.FromDays(1)); // Run the timer now and schedule to run once a day } </code></pre>
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1. POHow do you track hosting / domain / SSL certificate expiry dates for customers?
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1. USjoshperry
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