After installing 10.2.3 I received the following error when selecting the Users option on the Spectrum Control Panel, "SPC-OCP-10036: Could not connect to the SpectroSERVER on FRA1VOPB02T. Either no user model exists or the .hostrc file does not permit this host to connect." The .hostrc file contains a + and the spectrum install user is in the Spectrum database.
The user logged in with windows as Spectrum instead of spectrum as the install user shows. Capitalization matters with Spectrum where on a Windows server the capitalization does not matter for the username.
Log out of the Windows server and back in as user spectrum (lowercase s) resolved the issue.