Thanks for posting!
Let's try restarting the admin server. To do this, open the terminal through /Applications/Utilities/Terminal.app. Then enter:
fmsadmin restart adminserver
Then, head to http://localhost:16000 in the browser of the server and attempt to launch the admin console from there.
If this still fails, we'll need to verify that the appropriate ports are open. Open the Network Utility located in /Applications/Utilities/ and select the option for "Port Scan". In here, you'll want to enter localhost where it prompts you to "Enter an internet or IP address to scan for open ports." and check the box labeled "Only test ports between". In the first box to the right of that check box, enter 16000 and 16004 in the second one. Once everything's set up, click Scan and post the results.
Thanks for your reply.
This is what happened;
I used Terminal to restart the server as you suggested, but got the same result after going through the Deployment assistant: Admin Server Connection Error: An Unknown error has occured
Then I used Network Utility for Port Scan and got this: Port scanning host: 127.0.0.1
Open TCP Port: 16000
Open TCP Port: 16001
Open TCP Port: 16004
Port Scan completed
How many NICs does this machine have? Try disabling them all, rebooting and attempting to launch the admin console again.
In the Network control panel I delete all networks like Ethernet and Airport so there is no networks available at all and click apply.
This time I get a step further with the deployment assistant. Please see link below to what happened:
Gave it another try after restarting the Mac and now it works! It seems to be a very 'moody' piece of software :-)
Thanks for your advise. I might come back to this thread though, if I get any other problems.