After upgrading Spectrum and CAPC, I cannot add Spectrum as a data source as CAPC cannot talk to Spectrum.
CA Spectrum and CA PM integration breaks after CA Spectrum upgrade. This happens when SSL is enabled and CA Spectrum is connected to CA PM using https.
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Release : 10.4
Component : Spectrum Core / SpectroSERVER
https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/spectrum/10-4/integrating/ca-performance-management-and-ca-spectrum/troubleshooting-ca-spectrum-and-ca-performance-management-integration.html