Concepth Engineering's SpiceVision Pro is an EDA tool which is capable to take your spice netlist into a schematics view.
Normally, "no WDB server" is caused by old license file and wrong paths.
I thankyou very much for your kind reply. I registered myself with concept.de (for spice netlist viewer) and hope get a trail license.
Yes you are right in the case of S-Parameter generation, it was the problem with license update.
If this was a transistor level Spice netlist generated out of an IC design, SpiceVision could be of benefit. However for a BoardSim topology the extracted Spice netlist is just a sequence of transmission lines that you can visualize in LineSim. You could do first LineSim schematic export and then out of LineSim extract netlist and you would get same result.