Reached the limit with the first one:
root@vserv2200.swisslink.ch:/root# service apache2 stop
root@vserv2200.swisslink.ch:/root# certbot certonly -d kreator.ch --standalone
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for kreator.ch
Waiting for verification…
Cleaning up challenges
Generating key (2048 bits): /etc/letsencrypt/keys/0010_key-certbot.pem
Creating CSR: /etc/letsencrypt/csr/0010_csr-certbot.pem
An unexpected error occurred:
There were too many requests of a given type :: Error creating new cert :: too many certificates already issued for exact set of domains: kreator.ch: see https://letsencrypt.org/docs/rate-limits/
Please see the logfiles in /var/log/letsencrypt for more details.