I have installed the iFolder client (3.8) on a new PC.

When I try to connect I get this error:

iFolder is unable to verify "https://iFolderserver:443/" as a trusted server. You should examine this server's identity certificate carefully.

After trying both Yes and No a few times I eventually got in.

After a PC re-boot I tried iFolder again and got the same prompt.
iFolder is unable to verify "https://iFolderserver:443/" as a trusted server. You should examine this server's identity certificate carefully.

Now if I answer No I get back to this prompt.
If I answer Yes I get an error saying:

An error was encountered while connecting to the iFolder server. Please verify the information entered and try again. If the problem persists, please contact your network administrator.

I have re-started the iFolder server, uninstalled the iFolder client and removed the Simias files then re-installed the iFolder client and it's still the same.

What should I do?