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I am trying to set up printers for users, and the print server is in a forest with a trust relationship. Users are all on Windows 7, and the print server is Server 2008 R2 Standard.

DomainA contains the print server DomainB contains the users

When users or admins in DomainB attempt to add printers from the DomainA print server, they get a generic error that says "Windows cannot connect to the printer. Access is denied"

I have added DomainB users to the DomainA printer security w/ print rights, still getting the same error. I've even tried creating a Domain Local group in DomainA, and added users from DomainB, and it still fails whether I'm using a standard user or a domain admin in DomainB.

When adding the printer via IP, it works, but that's not running through the print server and isn't an acceptable solution in our environment.

What do I need to do to get this cross-forest printing working?

Printer Wizard error

ADDITIONAL INFO FROM TESTING: DomainB user is able to browse file shares on the DomainA print server, but adding printers flags the error. DomainB user was able to add certain HP/Brother printers, but Ricoh and Canon printers fail. All the printers they were able to add were printers who's drivers are included by default in Win7. This seems to only occurs when the print driver needs to be downloaded from the print server. Possible share missing or with wrong permissions?

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What kind of errors are you getting if you create a shared disk resource on the print server and attempt to access it as a user from the other Forest? –  Evan Anderson Feb 7 '13 at 21:18
    
Do printers work from inside of your own forest as expected? When exactly do you get an access denied? Can you post a screen shot? I get the feeling this might be a Point and Print error and you're barking up the wrong tree. –  MDMarra Feb 7 '13 at 21:44
    
Also, can you use other resources (especially connect to shares) from the print server in the trusting domain? –  syneticon-dj Feb 7 '13 at 22:14
    
How are DomainB users printing currently? It sounds like there is already a print server in DomainB (according to your "acceptable environment"), so wouldn't it just be easier to create a printer object on DomainB's print server for the same printer that is on the print server in DomainA and just let DomainB users continue to use their own print server? –  TheCleaner Feb 7 '13 at 22:24
    
DomainA users are in North America, and DomainB users are in Europe, so currently DomainB users don't have any printers unless they connect directly via IP. –  MarkF Feb 7 '13 at 22:30
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2 Answers

It sounds like the Forest Trust is using Selective Authentication. If so, you need to grant DomainB users the "Allowed to Authenticate" permission on the print server computer object in ADUC in DomainA.

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I've checked the trusts, both incoming and outgoing are using domain-wide authentication, not selective. –  MarkF Feb 7 '13 at 22:46
    
You mentioned that the user accounts were migrated from DomainA to DomainB, do (or did) the UPN Suffix for the users migrate as well? I wonder if there's a UPN Suffix conflict? –  joeqwerty Feb 7 '13 at 23:50
    
I've checked in the user's account tab in AD Users & Computers, they have the correct new domain suffix. Is there somewhere else I should check on this? –  MarkF Feb 8 '13 at 0:33
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Check your GPO gpresult /z or gpresult /h on a failing machine under a failing user account and see if you have any Point and Print restrictions enabled in your Group Policy. If you do, you'll have to add the FQDN of the printer server in the other forest to the list.

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There were NO Point and Print restrictions on this machine when I started troubleshooting. During troubleshooting I enabled the policy under Computer Config for this test machine and left everything blank and un-checked except for enabling the policy. They don't need this policy, should I remove for testing? –  MarkF Feb 8 '13 at 1:15
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