I simplified the schematic significantly but the router has done just about 70% of the work. :-( I don't understand. 

Suggest you follow the advice in the Autorouter Readme.txt file: "7. Tell the error detail to us and send your PCB file as EasyEDA Source file to [support@easyeda.com](mailto:support@easyeda.com)."

@andyfierman [https://easyeda.com/forum/topic/Autorouter-Not-Functional-c21361c54fbe4a69acda735f734a48f7](https://easyeda.com/forum/topic/Autorouter-Not-Functional-c21361c54fbe4a69acda735f734a48f7) This is the exact issue I had when trying to reproduce the via placement issue.

@cjohnson, Thanks for pointing me to that: I hadn't made the connection (sorry about the pun but I couldn't resist it).

@UserSupport could you recommend smthng? I shared the project to analyze. I try to simplify the PCB, making half of the router work, lock some, most evident, traces, but still have no success. 

@andyfierman Ha! Good one. I found earlier if you have any incomplete nets in the schematic, as in any nets that don't connect anywhere, the autorouter fails. Looking at your project you dont have that issue. Maybe trying changing the +5V- net to just 5V? They commented on my post saying special characters can screw it up.

I think your problem may be having the board outline directly underneath U4. Using Tools > Set Board Outline... I created a new board outline and set it to be well away from the edge of U4. Thats all I did. The [local] Auto Router took around 1 second to complete 100%.  Regards.

@mrtom528, Good spot. Thanks for sharing that.

@fedorov, @mrtom528, @cjohnson, The problem is not that the silkscreen overlaps the Board Outline. I do not understand what is causing it but there is a problem with the Board Outline itself. **Simply resetting the Board Outline to the same dimensions fixes whatever the problem is.** If I open: [https://easyeda.com/fedorov/dry-contacts-shield-esp32](https://easyeda.com/fedorov/dry-contacts-shield-esp32) and do:     **OR: **  **then I get 100% routed!** 

@andyfierman, @fedorov, Interesting! Thanks andyfierman. I did some more experimenting and found this... The original outline comprises of three sections, top, left and 'right + bottom'. Splitting the 'right + bottom' into two parts, making a total of four, also results in a clean 100% auto-route. Curiosity got the better of me and I tried just one continuous outline, again the auto-router was 100% clean. So it appears that a rectangular outline comprising of three parts is contributing to the error. Possibly?  I guess this also explains why my original solution using 8 parts, and the simpler single continuous solution from andyfierman worked. Whilst testing I did come across another issue. Whilst the [local] auto-router is running, pressing 'cancel' doesn't actually stop the auto-router, it just closes the window. The auto-router 'appears' to continue to run in the background until it gets a solution one way or another. I actually had this happen on the 'cloud' auto-router too which is the screenshot below. Check out the Error message that popped up a good 5 minutes after I pressed 'Cancel'...  This popped up under the 'Information' window whilst the [cloud] auto-router was running. When using the local auto-router the cmd window almost instantly reports that the connection is lost and yet continues to run, and successfully too. Pressing 'Stop Router' does appear to stop the routing process. Hopefully some of that may help shed some light on the issue. Thanks again. Regards.

@fedorov I haven't never used an autorouter. Interesting.... I guess I could call myself "a human autorouter" :-D

@markus_jidoka, I don't recommend using an autorouter because unless you they can cause all sorts of problems. If you do have a very good understanding of PCB layout then they can be useful as they route a board fast enough that you can try different setups and pre and post routing adjustments. I used it that way for the first time recently and saved a lot of time but that was a special case of a complicated board but with very few constraints because it was only running at a maximum of 32kHz with very slow edged 4000 series CMOS logic. It was also carefully placed before any routing was started.

Copy not cut! "I don't recommend using an autorouter because unless you **have a very good understanding of PCB layout** they can cause all sorts of problems."

Thank you very much, colleagues!!!