Trust Relationship over WAN

Both sides can ping each other and both sides recieve information about the other PDC when typing "nbtstat -a PDC"

Try adding the addresses to the LMHOSTS file.
c:\winnt\system32\drivers\lmhosts
example

10.0.0.0    computername        #PRE

done , but still can't find the PDC

The computer must be rebooted after adding the entries to the lmhosts file, or nbtstat -R   can be run from the command line to reload the netbios cache table.

Reboot done after LMHOSTS file import ....
 

A Few things to check --  (From My Enterprise Training)
   --  Only Admnistrators can setup trusts (This is a given). You must be signed on as        administrator to establish/accept a trust.
   --  The PDC's must be "free of session's". There can be no connections between the two        computers (No Shares or connections).
   --  Both Computer must have a common protocol (which I believe that you have with        TCP/IP)
 
Setup your Trusts on the Trusted side first. Then Do the Trusting Side...

Let me know if this helps. Make double sure there are no shares between the machines this is a big kicker.

Ok you have DomainA and DomainB.  I'm assumming you know the difference between trusting and trusted so I won't explain that.
steps:
1.  Log on as Administrator in DomainB
2.  Start User manger for domains.
3.  Choose Policies, Trust Relationships
     the Trust Relationships windows comes up
4.  Click on the  Add button next to the Trusting Domains box.
     the Add Trusting Domain window comes up
5.  Enter the name of DomainA, the initial password and confirm      password.  Hit OK
6.  Log on as Administrator in DomainA
7.  Start User manger for domains.
8.  Choose Policies, Trust Relationships
     the Trust Relationships windows comes up
9.  Click the Add button next to the Trusted Domains box.
     the Add Trusted Domain window comes up
10.  Enter DomainB and the password used in step 5.  Hit OK

This will set up a one-way trust, to set up a two way trust do the say thing but switch DomainA with DomainB and vice-versa.

Since One domain is in Tel-Aviv and one in LA I assume that two people are working on this at the same time.  You should do this over the phone at the same time.  Make sure that DomainB is set up to trust DomainA before you start up on DomainA (otherwise Domain will return an error stating that there trust relationship can not be verified at this time.

If you have any questions just ask,

Joe

Thanks but that's what i know myself , the problem is that when i try to add the second domain it cannot find it's PDC

Did you check the shares between the machines?

what shares ??? , i can map the C$ of the other domain .

You just need to be sure that there are no shared resources (ie like Mapped Drives) between the two machines. This will cause the trust to not work.