Apparently, this is not an error. This is what I just received from support.
The error you are seeing is a mislabeling of a different message which should show there are no apps to be updated on your PC as the Security feature in Health Check does not support any of the apps on your PC.
This mislabeling will be corrected in the next update to CCleaner until this issue is resolved you can use the Software Updater function in CCleaner as this performs the same function as Security under He
That is simply an incorrect message being shown by Health Check. (The developers are aware and will fix it for the next version).
It IS connecting to the server, but isn't finding any software updates.
I've tested it myself and saw the following:
When the seperate tool Software Updater reports that your applications are up to date HC instead wrongly says 'Unable to reach the server'.
When there is an application to update Software Updater says so, and so does HC - So HC is obviousl