Tx once again.Indeed the server pc is behind a (wifi) router (firewalled too). Serve-U does indeed use by default port 21. Keep in mind, I had to use the correct settings while configuring the router's firewall/ports. At least in theory the same settings should apply to the windows firewall. Obviously I am wrong because it does not work. I will definitely try/follow what you posted. One never knows. Interestingly enough, even on the intranet (local wifi network), the Ftp is blocked when the windows firewall is switched on, on the serving pc! The other two pc's (on the local intranet), can not access it and neither can both my kids access it from their Samsung tablets nor can my wife from her laptop, as well as I, from my wifi enabled cell phone. All the other stuff can be accessed though. (there are over 300 dvd/blueray movies on the server pc which the children can watch/stream in their bedrooms on the mentioned tablets). Definitely something going on with the windows firewall.