Can anyone help me I cannot seem to solve this problem.  I tried everything.

We have 3 untrusted domains,  I keep getting the below error message, in just 2 untrusted domain, not with any computers in the computer where SCCM 2012 is located.  It seems it is only in the 2 untrusted domains.

DCOM was unable to communicate with the computer ComputerName.PUBLIC.xyz.LOCAL using any of the configured protocols; requested by PID      988 (C:\Program Files\Microsoft Configuration Manager\bin\x64\sitecomp.exe).

Thanks

You mentioned sitecomp.log so there must be site systems in the remote forest, right? Which ones?

Yes, we have site system in the untrusted domains.   2 Site servers in each of the 3 untrusted domains.

DP, MP, are installed on each server

Hi,

Please make sure the site server to initiate connections to this site system needs to be selected. 

The account you specified to install site system roles must has administrative rights on the untrusted domains site servers.

Cross Forest Support in ConfigMgr 2012 Part 3: Deploying Site Server / Site Systems in an Untrusted Forest.

Best Regards,

Joyce Li