VPN protocol to use and where to purchase cheap/free SSL certificate for VPN and RDP

I have a test Win2016 server at home using DDNS for VPN.  Then users can access their RDP sessions for file sharing.  Eventually, I would like to setup a production server using the same config.  At the moment, only PPTP protocol for VPN is used but I'll like to have a more secure VPN connection using either L2TP/IPsec or SSTP.
Pls advise, thanks.
Soho_DanAsked:
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JohnBusiness Consultant (Owner)Commented:
I use an external box for this (all clients) . Cisco or Juniper- IPSec VPN

Works great
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JohnBusiness Consultant (Owner)Commented:
In a test environment that will become production, a Cisco RV series router is inexpensive to get started
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Rob WilliamsCommented:
I agree with Jon on the RV series Cisco/Linksys series.  Great value and reliable.  
However if you set up an RD Server, it requires a domain controller, and licensing server. You might as well install the other default services if you haven't done so; RD Gateway and RD Session host.  This will allow you to connect using SSL encryption, no need for a VPN, and in my opinion more secure.
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Rob WilliamsCommented:
Sorry, missed the part about a free certificate.  Probably the most recognized free option is:
https://letsencrypt.org/

That being said, free and secure are hard to include in the same sentence.  Personally I prefer GoDaddy.com or rapidssl.com
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Soho_DanAuthor Commented:
Client prefers to use Sonicwall firewall appliance which they are familiar with.  I'll have to check out how to setup RD Gateway and install Certificate for it.
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Rob WilliamsCommented:
SonicWALL is as good or better than the Cisco RV series
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JohnBusiness Consultant (Owner)Commented:
They are about equal for what you want so use Sonic Wall
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Soho_DanAuthor Commented:
Thank you gentlemen!
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JohnBusiness Consultant (Owner)Commented:
You are very welcome and I was happy to help.
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Soho_DanAuthor Commented:
One more question for Rob Williams.  What about ssls.com?  They seem cheaper.
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Rob WilliamsCommented:
I am not familiar with ssls.com, thus of no help, however hard to be cheaper than  https://letsencrypt.org/  which is free.
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Soho_DanAuthor Commented:
Looks like letsencrypt.org support is not that great.
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