Obtain the cross-certificate (the “bridge”) from the private CA owner and install it in the Intermediate Trust store.
The error log read: FATAL: r2r root certificate is not installed. SSL handshake failed. r2r root certificate is not installed
Priya leaned back and typed a quick post-mortem for her team: Our machine was missing the R2R (Root-to-Root) bridge certificate for the partner’s private CA. The error message is misleading—it doesn’t mean a file named ‘R2R’ is missing. It means the chain linking our public trust to their private trust is broken. installed it via Group Policy
She requested the updated R2R bridge certificate from Liam’s team, installed it via Group Policy, and restarted the sync service. and restarted the sync service.