Let’sEncrypt: It seems the CA server is busy now

Today I install the free ssl of Let’sEncrypt for dreamglasses.com, and meet the following error: It seems the CA server is busy now. I checked the installation error log and got the following information from https://curl.haxx.se/libcurl/c/libcurl-errors.html

curl: (35) SSL connect error

When we use curl to visit https, nss is too old, so I upgrade it:

yum -y update nss

After the last step is upgraded successfully, I then upgrade acme.sh:

acme.sh –upgrade

When the above 2 steps are ok, I reinstall ssl, very thing is ok!