It is not possible to synchronize a domain name server with the registrar under Top > Service Director > Domain Manager > Domains > domain.tld > Name Servers > Synchronize with the registrar
The domain.tld domain is registered with the CADiware plug-in.
The following error is shown in the DEBUG OBAS log (
[2015/05/30 19:47:09] [ERROR]  [HSPC::MT::DM::report_to_action_log] Name Servers were not synchronized due to an error. Empty response from server
Such behavior was classified as the software issue PBAS-29974 and was fixed in OBAS 4.5.5 release.
To resolve the issue, please upgrade to 4.5.5 as described in How to upgrade OBAS system to the latest available version.