Hi,
Port 80 is blocked by my ISP and I'm unable to present challenge to Letsencrypt using http file challenge and Letsencrypt don't allows me to change port number to other than 80.
There's another way to do this using dns challenging where challenge is set in DNS TXT record. I'm using dynamic DNS duckdns.org and with a simple GET I could set and clear DNS TXT record.
Is there a way to use this challenge option?
Thank you.
Best regards,
Marcos Sibuya