#420 add info on FAQ

FAQ.md

@@ -611,3 +611,16 @@ Also make sure to check again on your power supply - it needs to deliver equal o
 Just replace the file `/home/admin/raspiblitz/pictures/logoraspiblitz.png` with a PNG of the same dimensions.
 
 NOTE: On updates this change will get lost and you might need to redo it.
+
+## I cannot connect per SSH to my RaspiBlitz. What to do?
+
+- Check the command again with how its on the display  - do you have it typed in correctly?
+- Replace `ssh` with `sudo ssh` and try it (laptop admin password might be required).
+
+If that not works ry to ping the IP of the RaspiBlitz with `ping [IP-of-RaspiBlitz]`. If you get no response on the ping requests the device is not reachable try this check list:
+
+- Make sure that your RaspiBlitz and your laptop are really on the same local network
+- Check if you have a VPN running on your laptop - some VPNs block local network
+- Some Routers have `IP Isolation` switched on - not allowing to devices to connect
+
+If that all is not working: Join the conversation on [GitHub Issue #420](https://github.com/rootzoll/raspiblitz/issues/420).

README.md

@@ -120,6 +120,8 @@ Now open up a terminal ([OSX](https://www.youtube.com/watch?v=5XgBd6rjuDQ)/[Win1
 
 **Now follow the dialoge in your terminal. This can take some time (prepare some coffee) - but in the end you should have a running Lightning node on your RaspberryPi that you can start to learn and hack on.**
 
+* [I cannot connect per SSH to my RaspiBlitz. What to do?](FAQ.md)
+
 ## Support
 
 If you run into a problem or you have still a question, follow the steps below to get support. Also check the [setup documentation](#setup-process-detailed-documentation) for details.