My TH vias are not connecting to the power planes in the board.

[slow_rider]

I have an 18 layer board, Among the planes I have +5V, -5V & +1.8V. There are TH vias with the same net names that I was hoping to connect to those planes in the stack-up, however no connections are made and the nets are reported unrouted.

I've tried adding a rule to power plane hookup for example: IsVia and InNet('+1.8V') but it does not do anything (testing the query does return the correct results).

Any advise?

[thm_w]

https://fedevel.com/forum/course-questions/19568-via-s-not-connecting-to-power-planes

https://electronics.stackexchange.com/questions/676556/using-vias-with-power-and-ground-planes-in-altium-designer-20-2-4-cross-error

Screenshot of the via properties, rules, plane settings might help

[free_electron]

Are they true planes ? and not polygons ?
If they are planes you need to assign the net to the plane or plane section.

This is not a rule problem. it is a net assignment problem

[slow_rider]

I have included the stack-up.

Layer 7 is a plane with net +1.8V.
Layer 11 is a plane with net +5V.
Layer 12 is a plane with net -5V.

Layers 1, 2, 3, 5, 9, 14, 16, 17, 18 are signal layers with polygon net GND.
Layers 4, 6, 8, 10, 13, 15 are true planes with net GND.

When enabling view of a single plane layer and I can see an X over the via, does that mean it is connected or not (attached screen capture).

I have a rule for power planes and polygons with the first object: IsVia and (InNet('+5V') or InNet('-5V') or InNet('+1.8V'))     

[free_electron]

how is the plane connection defined ? direct connect or relief connect ? toggle it to relief connect and go in single-layer (shift-S) mode on one of the power planes. you should see the wagon-wheel of the thermal spokes around the via.
I believe that cross you see means it is connected. ( i rarely use true planes. i'd have to try it, can't remember)

Altium draws true planes in negative (industry standard)

What is that rule you keep talking about ? the connection mode ? (direct or thermal)

[envisionelec]

X over the via means a connection is made. Verify this in 3D mode, single layer.