Can't update Servoy Application Server

I have a new installation by a new customer and I want update Server from 7.2 to 7.3.1 ,but i get a error.
On installation by other customers it works fine. I expect a firewall problem.
The error occurs when i start the servoy_updater.bat file. Access to http://downloads.servoy.com is possible.
Error Message is on attached screenshort.
how can i solve this problem?

BR
Andreas

Most of the times that this happening, the customer is working behind a proxy server.
You can set those properties in the bat file: http://viralpatel.net/blogs/http-proxy- … roxy-java/

Yes, the customer is working with proxy server. But if i do some settings in net.properties File
the error disappeas and the result is … No update found and in service_log i get a lot of lines “WrapperManager Error: Unexpected exception opening backend socket: java.net.SocketException: Can’t connect to SOCKS proxy:Network is unreachable: connect”
Finnaly the Server is on old version and not updated.
Any idea to solve the problem ?
BR
Andreas

additional questions:

  • the server must be stopped during the update?
  • is there any special setting in server admin page required ?

BR Andreas