FEKO Wire port: "Segmentation rules at a connection point have been violated"; "Undefined wire port segment". How to identify the location and fix?

I am getting a bunch of errors telling "Segmentation rules at a connection point have been violated"

I guess, it is because I am trying to connect a wire port to a solid object. At its zero-vertex, or its flat surface.

So I tried moving the port wire away from the vertices on the surface... but the other side is still connected to a zero vertex of the flat tube.

So the question actiually extends beyond identifying the problemmatic place. I would also be happy to know how to connect the wire port with a guaranteed avoidance of problems.

The following message from the master process (MYID= 0):
The following message from the server process (MYID= 3):
ERROR 2712: Segmentation rules at a connection point have been violated
See also message in the output file Coax1a.out
The following message from the server process (MYID= 2):
ERROR 2712: Segmentation rules at a connection point have been violated
See also message in the output file Coax1a.out
The following message from the server process (MYID= 1):
ERROR 2712: Segmentation rules at a connection point have been violated
See also message in the output file Coax1a.out
ERROR 2712: Segmentation rules at a connection point have been violated
See also message in the output file Coax1a.out