Cu.cc is a free extension which permits us to test the possibility to have a domain name, how to manage it, etc.
If you encounter the following error when trying to setup a free SSL certificate from Let’s Encrypt for a cu.cc domain name :
An unexpected error occurred:
There were too many requests of a given type :: Error creating new cert :: Too many certificates already issued for: cu.cc
It just means that too many certificate have been created for this extension.
You should use another one with just one particle.
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