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SBS 2011 Securing Port 443 on firewall so only one External IP can access

Posted on 2015-02-11
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Last Modified: 2015-02-12
Hi Guys

On scanning my public IP address I noticed that port 443 was open using port forwarding.  This is obviously for owa and remote workplace etc but I was wondering if there was a way I could secure it more.

Is there away that I could say by a domain name say remote.com and then have a forwarder setup with my hosting company to my public IP address.  I then could make a rule to only accept ip traffic from 1 ip address ie my hosting company and block all other access from all other traffic?  I have setup my firewall to report of any DOS attacks etc and I am getting loads of them and want to make my business more secure.

Regards

Simon
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Question by:cybersi
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by:David Atkin
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Have you considered using a VPN for your remote clients and then removing the port 443 NAT rule to stop external access?
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by:cybersi
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Yes we use VPN already but some of our external uses love the remote work place
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by:tmoore1962
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If your VPN client connects to the router then you can still use remote work place, just connect vpn and then use the internal address used to connect to the remote workplace.
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by:cybersi
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Is there not away to do it as mentioned above?
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by:cybersi
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Is there not away to do it as mentioned above?
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by:David Atkin
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Another option would be to change the HTTPS port on the router to another port number.
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by:David Atkin
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Looking at using a https proxy server may also be an option but I think it would be difficult to maintain in my opinion.
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by:cybersi
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Sorry I have never heard of that. How does it work?
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David Atkin earned 500 total points
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Do some googling on it.  Basically HTTPS requests are send via another server.  Providing that your clients are using the proxy server then you MAY be able to setup the NAT rule to specify the proxy IP Address.

I've never attempted it myself though.  Not entirely sure if it will work like that...

Your better option is to get the remote users using a VPN or change the HTTPS Port on the router.  

In most instances though I tend to leave everything as standard.  Providing your users have decent passwords and the server is up-to-date then it is fairly secure.
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