Discoverer Gatekeeper Error/Widearea network connection failed

Have installed vision (WINDOWS) and configured discoverer plus. It works fine from the local machine(server itself) and am able to run the reports.
When i try to connect to Discoverer plus remotely it comes to a point where it keeps loading the applet and finally throws error "gatekeeper connection failed"/"wide area network connection failed" falied to connect to locator.
I have opened the ports 10000/1538/1548/443.... along with the other ports where i am able to login into applications.
Please let me know what other ports need to be opened? How to fix this issue so that i can connect remotely and run the discoverer reports.
Thanks...Raj

also ran chkdiscoverer.bat here is what i see:
Looks like gatekeeper is not running. the registry variable is already set but gatekeeper is not running.
CheckDiscoverer: Version 4.1.48.00 on 5/27/08 7:47 PM
Initializing ORB...
ORB initialized successfully.
Checking for OSAgent...
Found OSAgent.
Checking for OAD...
OAD is running.
Checking for Discoverer Preferences component...
Discoverer Preferences component is registered with OAD.
Checking for Discoverer Server...
Discoverer Server is registered with OAD.
Binding to Discoverer Server...
Successfully bound to Discoverer Server.
Checking for Discoverer Locator...
4.1.20
Found Discoverer Locator.
Binding to Discoverer Server using Discoverer Locator...
Successfully bound to Discoverer Server.
Checking for Gatekeeper...
file:/C:\OracleApps\sionora\iAS\Apache\Apache\htdocs\discwb4\applet\gatekeeper.ior
WARNING: Attempting to use HTTP Firewall Proxy Server
due to security restrictions: org.omg.CORBA.INTERNAL[completed=MAYBE, reason=Can not find G
ateKeeper: org.omg.CORBA.NO_IMPLEMENT[completed=MAYBE]]
Error: Gatekeeper is not running. Clients outside the firewall will not be able to connect.
Hint: Open the HKEY_LOCAL_MACHINE/Software/Oracle Windows Registry key and make sure that the DCW4_S
TART_GATEKEEPER variable is set to 1, and then restart the Discoverer Services.

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