Problem with the Spectrum Tomcat trusting the UMP web server certificate and its root certificate.
spectrum version 10.2.1
UIM version 8.51
Earlier versions of Spectrum prior to 10.2.3, such as 10.2.1, did not have a pick list (drop down box) for protocol (https / http).
Upgrade to Spectrum 10.2.3 or open a Spectrum Technical Support issue to request 10.02.01.PTF_10.2.115
Spectrumgtw probe documentation for UIM: