I certainly have not altered my router settings since updating Apex yet the problem now exists where it did not.
However, I forwarded another port for TLS and that seems to have fixed the problem.
Perhaps when I updated it did not inherit the settings fully.
The settings in the security section of the client were all checked as shown in the guide.
Anyway, it seems you have helped solve my problem.
Many thanks for your speedy reply.
golfnut