Power divider simulation in CST

I have design a physical rectangular coaxial power divider ( 4 way) and wanna simulate in CST.
At first, I draw mechanical 3D then import to CST.
I'm using both waveguide port , lumped port but the results look not real (S21 ~ -108dB)
- Must I have terminate other port by lump element when simulate S parameter? I the CST example they didn't do like that.

Pls help, give me the guidance.

be clear about the difference of both ports.
i think waveport is used for waveguides mostly and lumped port for internal feed.
can we use both the ports for the model?
try using waveports only

still un-solve.