Question : How to solve those two problems

I have two problems with my asterisk server:
(a) When I try to register to the server with xlite(asterisk/client behind different nat) it works only when I specify the public ip address in xlite. If I put in the dyndns address, I end up with a 401 Unauthorized error. (The dydns updates ok)
(b) Whenever the pc reboots, the fxo is buggy in that I have to call the number for it to get initialised. The patch is found here https://issues.asterisk.org/view.php?id=14577 but I am not able to install it due to certificate errors.

Answer : How to solve those two problems

1. Try pinging the dydns address to make certain that it gives the same ip address.

2. If your system doesn't like the certificate on bugs.digium.com something must be the matter with it.    You could download it on your desktop and then just copy it across.