Trouble about vpn connecting (PPTP VPN did not respond)

I am new in mac. These days I have searched a lot on line for the solution to this problem but none fixed it. So....
Our lab only have an instruciton for connecting vpn under windows and I succeeded to do this by following this in windwos 7.
There is a host name instead of ip address in the instruciton and I think that should not be the problem.
And in the protocol of TCP/IP property settings, the user was asked to Remove the tick before “Use default gateway on remote network”. Besides, in the instruction, it sets to obtain the IP address and DNS address automatically, so that I do not have such inforamtion about the server of our lab.
In my new macbook pro (Mac ox lion 10.7.3), I did the following things:
1. in system properties->network, Select the + button at the bottom left of the screen to add a new connection.
2. Select the following:
a. Interface: VPN
b. VPN Type: PPTP
c. Service Name: SAS VPN
d. Select Create.
3. Configuration: default
    server address: host name “xxx.xx.xxxx.xx”
    account name: (I am sure there is no error in this)
   encryptiong: none
4. click Authorization settings to input the password.
5. Click the Advanced button. and Select Options. Verify Send all traffic over VPN connection is checked. (and is not checked ) (I tried both, none of them worked). About the other seetings.
6. On the TCP/IP tab, set "Configure IPv4" to "Using PPP." So I can not input the DNS server information.
7. click apply and then try to connect.
However, it returned me an error said " PPTP-VPN server did not respond. Try to reconnect. If that continues....."
I think there are lots of experts in mac os x. Can anyone here help me with this? Thanks a lot in advance!

>> encryptiong: none
I found out, that you NEED the encryption in Lion Server VPN.
I understand, that you use Lion Server as you mention the problem here in the Lion Server section.
I do the following: Install the "Admin Tool VPN" from App-Store for some Euros. Than I found section PPTP and there is a check for
a) Active
b) Compression and Encryption
I take the check for b) out and restart (Off / On), took my XP-Notebook and connected via PPTP and all working!
Since Lion Apple hide a lot of things from the official tools and if you have some special tools, you can activate function. There is
Level 1, the userlevel: Something like Dashboard in the new MS-Servers or the Server App in the new Lion Server
Level 2, the administrator level: The difference between Server App and Server Admin! The Server Tools you need download separatly as you know after a while, something is missing. Same with the new Airport Utility: Userlevel tool = AU 6.0 with grafical fun and some basics, AU 5.6 is the tool for the admin what you separtly need download.
Level 3, the special deeper view: Typically it is the command line interface, CLI, but if you need some GUI (grafical user interface), you buy an App like Admin VPN Tool and this tool (App for some Euros) in real does nothing else than comfortably set some inside switches and flags that the offical GUI admin tools not have realized.
Why?
Oh, I think it's because security issues. You want the Mac Server become like a Microsoft Server? So, you shouldn't use not encrypted connections and that's (in my understanding) the reason why the Lion Server EXPECTS YOU to use encryption and the official tools not give you the oportunity to switch the encryption off!

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But the connections from my network do not connect. Every time I click on "connect" for either network connection, I get the error "the pptp-vpn server did not respond. Try reconnecting."
I set up both connections in my Network Preferences according to the support page (http://macserve.org.uk/support/ivpn/):
My Airport Express configurations have never given me any problems with my home network:
And I think that I forwarded the ports properly (even though my firewall is not activated):
What am I doing wrong?

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Ports that are required for vpn are more complicated ..
See earlier post.. eg How do I set up L2TP VPN?
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The problematic ones are GRE and ESP which are protocols not ports.
I think you can pretty well assume the apple router running anything that has BTMM in it won't work.. since it will need the port 500 for itself.
On the old express try going back to 7.6.1 firmware.. I have to say I don't use the express.. lots of extreme and TC.. so their firmware issues are slightly different so firmware versions for the express are somewhat different.
Try not to use both port forwards (mapping if you must).. and DMZ.. they can fight each other.. if DMZ doesn't work it is better to turn it right off and forward all the required ports.
Let me recommend a test.
Plug your cable modem directly into the computer running the VPN.. so you have no NAT router in front of it.
Pay attention to the local firewall that apple runs and what ports you will need to open on it to get vpn to work.. this is your best chance to get remote vpn running. If you fail with the public IP on the computer it will certainly fail through NAT.. and generally local firewall will be an issue.
You should of course test that a client in the local lan can connect by the vpn.. it is always worth testing from the easiest configuration to the most complex.
So local lan just as you have now..
Then direct cable connection to the computer.
Then NAT router.. but you can pretty well assume apple routers are going to be problematic because apple want to dally at BTMM using same ports as IPSEC uses for L2TP.
My email is live.. roll your mouse over it and talk to me direct..

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Okay, so I read quite a few threads about this and can't really figure it out. Would be great if I can get some handholding.
I'm a complete newbie, trying to set up Server for home use. The VPN service seems to be running fine, but I just can't connect from the clients, it just keeps saying "The L2TP-VPN server did not respond". Here is a glimpse at my settings:
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If your router is an Apple device, select the Network tab in AirPort Utility and click Network Options. In the sheet that opens, check the box marked
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With a third-party router, there may be a similar setting.
4. Configure any firewall in use to pass this traffic.
5. Each client must have an address on a netblock that doesn't overlap the one assigned by the VPN endpoint. For example, if the endpoint assigns addresses in the 10.0.0.0/24 range, and the client has an address on a local network in the 10.0.1.0/24 range, that's OK, but if the local network is 10.0.1.0/16, there will be a conflict. To lessen the chance of such conflicts, it's best to assign addresses in a random sub-block of 10.0.0.0./0 with a 24-bit netmask.
6. "Back to My Mac" on the server is incompatible with the VPN service.
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"The L2TP-VPN server did not respond"

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