Can't successfully establish VPN connection from Windows client to SBS 2011 Standard using Juniper SSG5 firewall

Can't establish a PPTP VPN from a Windows client to Windows SBS 2011 Standard through a Juniper SSG5 firewall.
Server registers the connection but it fails on the client side with Error 806.
This works out of the box from the same client on servers with newer firewalls (with 1723 forwarded), but I do have port 1723 forwarded in the firewall and GRE enabled, and can see the server listening on 1723.
Juniper was not helpful, but was able to demonstrate with Wireshark that the client is requesting to close the connection after it is established.
Any known settings needed on Juniper SSG5 to enable this?  I should not that no VPN's are configured natively in the Juniper.
davebo4503Asked:
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JohnBusiness Consultant (Owner)Commented:
Wherever we have these devices, we use IPsec VPN.  IPsec is a deal more secure. Have you considered this? You may need a consultant to set it up.
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davebo4503Author Commented:
Hi John,
I agree, but this is for a one-off need I have.  The Juniper is end-of-life and out of support, and it will be replaced at some point, but I need to establish a VPN to get a project done.  Thanks for the response.
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JohnBusiness Consultant (Owner)Commented:
You can use a Non Juniper router because SBS 2011 has (should have) PPTP VPN built in.
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davebo4503Author Commented:
Thanks John - If I replace the Juniper it will be with a state of the art firewall.  The need I have is to establish the VPN without going onsite or changing equipment.  Was hoping to find someone who got this to work through the SSG5.  SBS does indeed have the PPTP built in and turned on.
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Sanga CollinsSystems AdminCommented:
I've been able to get this working. using 2 custom services in a group

1. group "other" 47 src 2048-2048 dst 2048-2048
2. tcp src 0-65535 dst 1723-1723

Note that for Microsoft Windows, the custom PPTP service must contain both TCP port 1723 and IP protocol 47 with port 2048. The source port for TCP 1723 must be 0-65535 to allow for any source port. 
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JohnBusiness Consultant (Owner)Commented:
Was hoping to find someone who got this to work through the SSG5

We use an expert consultant to set these up because they are very tricky with numerous interrelated policies to make things work.
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davebo4503Author Commented:
Brilliant!  Thank you Sanga!  You saved me a ton of time - exactly what I needed.
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