How to query logged in users across domains?

I am working from a Windows 7 Professional PC on DOMAIN1, but I would like to be able to query the users currently logged in to a Windows 7 Professional PC on DOMAIN2. My DOMAIN1\username is a local admin on the DOMAIN2 PC and admin on my DOMAIN1 PC.

I've tried running query user normally from my DOMAIN1 PC:

query user /SERVER:DOMAIN2PC
Error 0x000006BA enumerating sessionnames
Error [1722]:The RPC server is unavailable.

I've also tried it with psexec:

psexec \\DOMAIN2PC query user

PsExec v2.11 - Execute processes remotely
Copyright (C) 2001-2014 Mark Russinovich
Sysinternals - www.sysinternals.com

Couldn't access DOMAIN2PC:
The network path was not found.

Make sure that the default admin$ share is enabled on DOMAIN2PC.

I've tried it with PSLoggedOn:

psloggedon \\DOMAIN2PC

PsLoggedon v1.34 - See who's logged on
Copyright (C) 2000-2010 Mark Russinovich
Sysinternals - www.sysinternals.com

Error opening HKEY_USERS for \\DOMAIN2PC
Unable to query resource logons

The results are the same if I use an IP address instead.

If I log in to another PC on DOMAIN2 (with my local admin DOMAIN1 credentials), then the query user /SERVER:DOMAIN2PC works perfectly. I only have the problem when trying to talk across the domains.

Can anybody suggest what I can do to remotely query the list of users on a DOMAIN2 PC while working from DOMAIN1?