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Can somone guide me on how to Enable Web access on Untrust Interface on Juniper SSG 20

Hi,

First you need to make untrust interface manageable (let's say it's eth0/0):

set interface ethernet0/0 ip manageable

Then you can enable service you want on the interface:

set interface ethernet0/0 manage web (or "ssl" if you want https)

Here's a good article from KB how to do the same with GUI: http://kb.juniper.net/KB4718

If this is a true untrust public interface do make sure you use "ssl" and not "web" for the access.  With "web" your user/password will pass on the internet in clear text.

Don't use telnet or web on any public networks and avoid them even on private ones when possible.