Unable to create tracks from one component to other

I am new user to Kicad. I am trying to make a layout in pcbnew for which I have first created a schematic and also footprints of components.
From the image, Kicad is showing the ratsnet connected from the QFN pads(as we can see in the layout) but not allowing to create track from those pads. This problem is not for all ports, I can make tracks from the GND pads. SAVE_20181226_224815|690x431


Please if someone can suggest some solutions.

KiCad does not allow you to violate DRC when creating tracks. The default DRC settings are quite conservative. Check your manufacturers capability page and setup the project accordingly (Check under setup -> design rules for changing the track clearances and widths. And under setup -> pads and mask clearances to setup solder mask related parameters)

If you still can not add traces after seting up DRC with your manufacturers capabilities then you either need to switch manufacturer or change your parts to ones that are more forgiving.

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Thanks. I did some changes in Global parameters like minimum width, etc. And it is working.

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Just to make sure: You did check that your manufacturer can produce a board with your settings right?

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