Too many failed authorizations recently:

[choungmin]

sudo certbot certonly --manual -d *.t3msp02.net --key-type rsa --preferred-challenges dns

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for *.t3msp02.net
An unexpected error occurred:
Error creating new order :: too many failed authorizations recently: see Failed Validation Limit - Let's Encrypt
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: t3msp02.net

I ran this command:

It produced this output:

My web server is (include version):

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know):

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

[rg305]

Hi @choungmin, and welcome to the LE community forum

Do you have access to update the authoritative DNS servers?

t3msp02.net     nameserver = scp-ns01.samsungsdscloud.com
t3msp02.net     nameserver = scp-ns02.samsungsdscloud.com
t3msp02.net     nameserver = scp-ns03.samsungsdscloud.com
t3msp02.net     nameserver = scp-ns04.samsungsdscloud.com

Please use the test/staging environment until such testing has been concluded.

If you will need to also secure it, you may also want to include the base domain in the cert ["t3msp02.net"].