Cygwin rsync and the Window XP SP2 firewall

Milutin Voinivich team at
Mon Nov 22 13:06:55 GMT 2004

The windows firewall show this message.
Because rsync client try to establish connection using port 873.

You can define rsync client and server to use other port like port 80.


Milutin Voinivich

----- Original Message ----- 
From: "Hans Kratz" <kratz at>
To: <rsync at>
Cc: "Hans Kratz" <kratz at>
Sent: Monday, November 22, 2004 12:16 PM
Subject: Cygwin rsync and the Window XP SP2 firewall

> Hi!
> We want to use cygwin rsync to implement an autoupgrade feature for our 
>   software. For that we invoke rsync to connect to an anonymous rsync 
> server on the default rsync port (873). This works just fine but there 
> is one problem. When rsync is invoked the Windows firewall displays a 
> message like this:
> "To help protect your computer, Windows Firewall has blocked this 
> program from receiving unsolicited information for the Internet or a 
> network" (see
> Despite this message rsync'ing works just fine.
> This message is usually displayed only if an application opens a server 
> socket listening for inbound connections on a network interface. Opening 
> a server socket on the loopback interface does not provoke this behavior.
> What does rsync do to provoke this message?
> How can I prevent this message from being displayed?
> Please cc me on any replies as I am not subscribed to the list. Thanks 
> for your help!
> Version details:
> Windows version: XP SP 2 [Version 5.1.2600]
> rsync version: rsync  version 2.6.3  protocol version 28
> cygwin version (uname -r): 1.5.12(0.116/4/2)
> Best regards,
> Hans
> -- 
> Hans Kratz
> Omnicore Software

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