Cesiumjs viewer blocking issue

I cannot render cesiumJS viewer because of security issue which blocks certain ports. Which port number cesium is using to render the globe and other things. can any one help me in resolving this issue.

Do you mean the port on which a CesiumJS app runs by default? That would be localhost:8080.

If you mean the network requests for terrain, imagery, and other assets, by default it is api.cesium.com:443 and assets.ion.cesium.com:443.

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OK Thanks Gabby_Getz