Did you changed something in the configuration of your router? Check there first to see if your OMV has a valid IP address. Then, if you can't access it from the network, can you maybe try to access it directly? That is, plug a monitor and a keyboard to your OMV server and check if SSH is running and try to deactivate the FTP and WebDav plugins. I really doubt that the data is gone, don't worry.
If the memory doesn't fail me, that might be an issue with your browser. Your server is reachable (PuTTY works). So, I would suggest to try to access the WebGui with another browser/device or, if that's not possible, clear the cookies of your browser and try again.
If that does not work do the basic troubleshooting: restart the server and give it a go.
If that still doesn't work, run OMV first aid from the command line and try to repair the WebGui from there.
Clear the cookies of chrome, that should do the trick.
No prob, glad to help.
Clear the cookies of chrome, that should do the trick.
Thanks again Eryan 
all back to normal, I will start over carefully to get ownCloud working over the internet
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