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Actually there are different admin passwords for both forests. 
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Actually there are different admin passwords for both forests.

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I can't even get that far. When I put in the domain, it errors out almost immediately.
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I can't even get that far. When I put in the domain, it errors out almost immediately.

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I have a domain in 2003 R2, Domaina.com, then I have a domain in 2008, domainb.com<br />
<br />
I am trying to setup a Forest Trust (Both are in 2003 Compatibility) and when I try to join from the 2003 side I get an error about no logon server available to service the request, though I have the forwarders in place on both sides and I can ping both domains from each other with no issues. Any ideas?
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I have a domain in 2003 R2, Domaina.com, then I have a domain in 2008, domainb.com

I am trying to setup a Forest Trust (Both are in 2003 Compatibility) and when I try to join from the 2003 side I get an error about no logon server available to service the request, though I have the forwarders in place on both sides and I can ping both domains from each other with no issues. Any ideas?

Setting up Forest Trust between Windows 2008 and Windows 2003 R2 issues

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.