I suppose that the "remote server" should be ZEO. In this case,
127.0.0.1 is not correct: it is the IP address of the local network and not accessible from outside. You would need the IP address of the external network or use a wildcard (to indicate any network).
It might be possible that the configuration supports DNS (= "Domain Name Service) names. In this case, you could replace
127.0.0.1 by the name of your host (the host name is typically mapped to the IP address of the external network).
I currently do not know the correct wildcard notation: it might be empty or
*. Either try out the option or look through the documentation (of
plone.recipe.zeoserver or the ZEO server XML schema.
Note that making your ZEO accessible from the outside poses a security risk. You likely want to require authentication for access to it.