aaPanel Let’s Encrypt SSL Not Working? Full Fix Guide

aaPanel Let’s Encrypt SSL Not Working – Full Troubleshooting Guide (2026)

Using:

And getting:

❌ “Certificate issuance failed”
❌ “Domain verification failed”
❌ SSL not activating

Here’s how to fix it.

—

Most common causes:

✔ DNS not pointing to VPS
✔ Cloudflare proxy enabled
✔ Port 80 blocked
✔ Domain not resolving
✔ Wrong website root
✔ Firewall blocking verification

—

—

Run:

$$
ping yourdomain.com
$$

IP must match VPS IP.

If using Cloudflare:

Set domain to DNS Only (Grey Cloud) during SSL issuance.

—

Let’s Encrypt uses HTTP validation.

Open ports:

$$
80
443
$$

Check firewall inside aaPanel → Security.

—

If HTTPS redirect enabled before SSL:

Disable it first.

Then request certificate again.

—

Ensure domain root folder exists:

$$
/www/wwwroot/yourdomain.com
$$

Wrong root → verification fails.

—

Restart:

✔ Nginx / Apache
✔ PHP

Then retry SSL.

—

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