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Once again guys. Should have stuck to cisco.<br />
<br />
Well isa backend server is set up as a vpn server. Vpn client access enabled and the vpn client access is configured to use pptp.<br />
<br />
I then publish this server on the FE box, telling isa to listen on a particular address on the external interface. <br />
<br />
I get error 800 enable to estabish vpn connection. when monitoring the FE server is find that a connection has being routed to the BE server which is denying it.<br />
<br />
I checked all the rules and they looked ok. any suggestions?
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Once again guys. Should have stuck to cisco.

Well isa backend server is set up as a vpn server. Vpn client access enabled and the vpn client access is configured to use pptp.

I then publish this server on the FE box, telling isa to listen on a particular address on the external interface. 

I get error 800 enable to estabish vpn connection. when monitoring the FE server is find that a connection has being routed to the BE server which is denying it.

I checked all the rules and they looked ok. any suggestions?

Vpn isa 2004 back to back Scenario

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.

Software Firewalls

Internet Protocol Security (IPsec) is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. IPsec includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPsec can be used in protecting data flows between a pair of hosts (host-to-host), between a pair of security gateways (network-to-network), or between a security gateway and a host (network-to-host). IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite.

Internet Protocol Security

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.