Newbie question, help!

[#1]

Hi,
I have a couple of websites that I run from home on my server and everything seemed fine until today 
For example, http://www.mr2mk1.net does not seem to be available externally any more (works fine on local LAN).  Router and server have been rebooted.
Yesterday I regraded from Premier to Option 2...could that be the cause?!
Sorry if it sounds a stupid question, just looking to eliminate all possibilites...
Thanks,  Phil.

[#2]

Check if your IP address has changed as premier has a static IP and BBYW has a dynamic by default.
If it is now dynamic, raise a ticket and ask for a static IP again but you may not get the same one so you may need to update any external DNS to point to the new IP.

[#3]

Thanks for the reply Peter...but i have just fixed the problem!
It appears that my PN Firewall was reset to Low due to the regrade, and that blocks Port 80...
...so I turned it off and Presto 
Panic over

[#4]

Hmm... I guess I should have tried the link first...     working for me also.
[edit to add] Ah yes, the PN firewall is set to on/low by default for BBYW products. It's caught out a few others so you are not alone.
More general Q to PN...
On a regrade, why do you not keep the PN firewall setting the same when changing products?