Get automatically alerted before your SSL certificate expires.
SSL certificate expiration is a perfectly predictable event, yet it's one of the most common causes of avoidable downtime. An expiring certificate instantly transforms your site into a scary error page for your visitors. Modern browsers block access with alarming warnings like "Your connection is not private" - and very few users will risk continuing.
The problem is rarely technical: most administrators know how to renew a certificate. The problem is organizational. The reminder email from the certificate authority ends up in spam. The admin who managed the certificate has left the company. The Let's Encrypt auto-renewal failed silently. The causes are numerous, but the result is always the same: an inaccessible site and an emergency to handle.
MoniTao solves this problem by adding an independent monitoring layer. Regardless of whether your certificate is managed by your host, Let's Encrypt, or a commercial provider: MoniTao monitors the expiration date and alerts you 30, 14, and 7 days before the deadline. You always have time to react calmly.
Here's what happens when an SSL certificate expires without being renewed:
Understanding the causes helps protect yourself better:
Here's how to quickly verify your certificate status:
Here's how to check your certificate expiration date from the command line:
#!/bin/bash
# Check SSL certificate expiration
DOMAIN="example.com"
echo "=== SSL certificate check for $DOMAIN ==="
# Get expiration date
expiry=$(echo | openssl s_client -servername $DOMAIN -connect $DOMAIN:443 2>/dev/null | openssl x509 -noout -enddate | cut -d= -f2)
# Convert to timestamp
expiry_ts=$(date -d "$expiry" +%s)
now_ts=$(date +%s)
days_left=$(( ($expiry_ts - $now_ts) / 86400 ))
echo "Expiration: $expiry"
echo "Days remaining: $days_left"
if [ $days_left -lt 7 ]; then
echo "⚠️ CRITICAL: Less than 7 days!"
elif [ $days_left -lt 30 ]; then
echo "⚠️ WARNING: Less than 30 days"
else
echo "✅ OK: Certificate valid"
fiThis script checks your certificate expiration date and displays remaining days. Integrate it into your monitoring or use MoniTao for automated 24/7 surveillance.
Avoid unexpected expirations with these best practices:
No, MoniTao is a monitoring and alerting tool. Renewal remains your or your host's responsibility. MoniTao alerts you early enough so you can renew calmly.
By default, you receive alerts at 30, 14 and 7 days before expiration. These thresholds are configurable based on your needs and typical reaction time.
Yes, SSL monitoring is automatically enabled for all HTTPS monitors, regardless of your plan. It's an included feature at no extra cost.
If the certificate expires, MoniTao will detect the SSL error on the next check and send a critical alert. But at that point, your visitors will already see the security warning.
Yes, MoniTao checks the complete certificate chain. If an intermediate certificate expires or is misconfigured, you'll be alerted.
Yes, create an HTTPS monitor for any subdomain covered by the wildcard. The certificate will be checked the same way.
SSL certificate expiration is a 100% preventable incident. With the right tools and processes, you'll never have to handle the emergency of a site blocked by an expired certificate. The key is having independent monitoring that alerts you early enough, regardless of what happens with your auto-renewal.
MoniTao automatically monitors your SSL certificates' expiration date as soon as you create an HTTPS monitor. You receive alerts at 30, 14 and 7 days before the deadline. It's free, automatic, and can save you hours of stress and lost revenue.
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