Invalid response...503 Error

Hi All,

Hopefully someone can help out a noob :slight_smile:


Command: /usr/bin/certbot certonly --dry-run --agree-tos --force-renewal --standalone --preferred-challenges http --http-01-port 54321 -d

Output: Saving debug log to /var/log/letsencrypt/letsencrypt.log
Starting new HTTPS connection (1):
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from []: 503


Server Centos7, HAProxy, Nginx

Self hosted web server, haproxy server; DNS hosted by NetRegistry (Australia)

The reported IP address is correct, the website is up and working AOK (both inside and out - via

Any help would be greatly appreciated - thanks


Issue resolved: bad http-request add-header configuration


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