申请SSL出现如下问题，应该如何解决呢？

------------------------------------------------------------------------------- Certificate not yet due for renewal; no action taken. ------------------------------------------------------------------------------- /opt/eff.org/certbot/venv/lib/python2.6/site-packages/cryptography/__init__.py:26: DeprecationWarning: Python 2.6 is no longer supported by the Python core team, please upgrade your Python. A future version of cryptography will drop support for Python 2.6 DeprecationWarning Saving debug log to /var/log/letsencrypt/letsencrypt.log Plugins selected: Authenticator webroot, Installer None Cert not yet due for renewal Keeping the existing certificate 第一次申请时候就提示这个了，一台服务器绑定多个域名是不是这个原因造成的，这个问题应该怎么解决呢？ 主要是想咨询一下这个问题怎么解决呢？