[Cpanel Blog] The site's security certificate is not trusted! May,2012

Hi Everyone

I am new to this forum and to cPanel so please forgive my ignorance and I am sorry if I have put this thread in the wrong place.

I have a dedicated server that uses WHM and cPanel with a small number of hosting accounts on it.
All has been going well with it until recently when I spoke to my supplier about how I could get Parked Domains to work on my accounts.
The supplier talked me through the process which was basically to go to tweaks and change a setting.
After doing this the issue with Parked Domains was solved and all was well and good.
I then noticed that any time myself or one of my clients tried to log into cPanel or Webmail we now got a warning screen with "The site's security certificate is not trusted!".

Now my supplier is telling me I will need to buy a SSL certificate to stop the warning message.

My questions are these:
Why would a small change to WHM cause such an issue?
How could I have had a https connection before and now I don't, is there some sort of certificate provided with new installs of WHM? Sorry I am pretty ignorant on certificates as you can probably tell.
Is it unreasonable of me to ask for the system to be put back to how it was without buying a certificate? Can that even be done?

I am not trying to be mean or anything and I am happy to buy a certificate if I need one but it is more the issue that it did work and now it does not and I just hate not knowing what caused a problem or how it was working before the simple change.

Any advice or guidance on this is greatly appreciated

Alex
The site's security certificate is not trusted!
[Cpanel Blog] Beast TLS Vulnerability May,2012

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