SERVER 2012 versions.
Go to Windows Firewall Advanced Security by goingin to Firewall / Advanced
Clcik on "Inbound Rules" Left of screen,
Scroll down to and find "Remote Access" rules
There should be approximately 6 rules which are set and are operational (Green) (Gre-In) (L2TP-In) (PPPT-In) etc
If not Green enable these rules.
If they are already enabled (Green) Open each are ensure that in the "Advanced Section" they have ticks next to the appopriate "Profiles" select Domain, Private, Public
If they do not exist, click "New Rule" and select "Predefined Rule" Scroll down and select Routing and Remote Access and continue.
In the next screen you may choose to add all of the predefined rules to the machine. You will be alerted if they alreday exist, then go back and find them in the inbound rules list.
If you wish to add your own porting rules:-
Click Add "New Rule"
Select Port, configure port UDP and add the port required, Click next,
Allow the Connection is ticked, click next
Select the area for the rule to apply, Domain, Private, Public etc, your choice, click next
Give the Rule a name such as "VPN PORT ####, click next,
The rule now appears in the "inbound Rules" section , middle of screen.
Go back to "Remote Access Management Console " screen and click refresh.
All the Operation Status state indicators should be ticked with green highlights.
If it is still red in areas you may require to add UDP Port 500, 4500, 1701, 1723..
I wish it would alert you as to which one port is the problem rather than fiddling. But the above worked for me.
Regards.
- "Ports required for VPN connection have been blocked by firewall
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