When running 
 

sfdx force:org:create -s -f config/project-scratch-def.json -a GeoAppScratch

I am getting:

ERROR running force:org:create:  Socket timeout occurred while listening for results.

Try this:
You may consider increasing the --wait parameter value to increase timeout.

I get the error a few seconds after I run the command and changing the wait parameter does not help. Could the fact that I am behind proxy be the issue? I have set it up as per following:  https://developer.salesforce.com/docs/atlas.en-us.sfdx_setup.meta/sfdx_setup/sfdx_setup_install_cli_firewall.htm? search_text=proxy and I am able to use such commands as sfdx update or sfdx:force:org:open etc.