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UDP Ports

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Hi,

UDP is connectionless, and you need a remote server to check if the port is opened.

A response received indicates it's opened, timeout indicates not.

Br, FireFox.


 

OS : Win XP SP2 (32 bits) / Win 7 SP1 (64 bits) / Win 8 (64 bits) | Autoit version: latest stable / beta.
Hardware : Intel(R) Core(TM) i5-2400 CPU @ 3.10Ghz / 8 GiB RAM DDR3.

My UDFs : Skype UDF | TrayIconEx UDF | GUI Panel UDF | Excel XML UDF | Is_Pressed_UDF

My Projects : YouTube Multi-downloader | FTP Easy-UP | Lock'n | WinKill | AVICapture | Skype TM | Tap Maker | ShellNew | Scriptner | Const Replacer | FT_Pocket | Chrome theme maker

My Examples : Capture toolIP Camera | Crosshair | Draw Captured Region | Picture Screensaver | Jscreenfix | Drivetemp | Picture viewer

My Snippets : Basic TCP | Systray_GetIconIndex | Intercept End task | Winpcap various | Advanced HotKeySet | Transparent Edit control

 

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Thanks for your reply.

How does that work if firewalls are blocking the packets, but the port is in fact open?

 

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The packet is not sent and timeout occurs.


 

OS : Win XP SP2 (32 bits) / Win 7 SP1 (64 bits) / Win 8 (64 bits) | Autoit version: latest stable / beta.
Hardware : Intel(R) Core(TM) i5-2400 CPU @ 3.10Ghz / 8 GiB RAM DDR3.

My UDFs : Skype UDF | TrayIconEx UDF | GUI Panel UDF | Excel XML UDF | Is_Pressed_UDF

My Projects : YouTube Multi-downloader | FTP Easy-UP | Lock'n | WinKill | AVICapture | Skype TM | Tap Maker | ShellNew | Scriptner | Const Replacer | FT_Pocket | Chrome theme maker

My Examples : Capture toolIP Camera | Crosshair | Draw Captured Region | Picture Screensaver | Jscreenfix | Drivetemp | Picture viewer

My Snippets : Basic TCP | Systray_GetIconIndex | Intercept End task | Winpcap various | Advanced HotKeySet | Transparent Edit control

 

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So a timeout either indicates a firewall-blocked packet or that the port is not open. How do I differate between these?

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I would say you can't without testing.

However, with some hope there could be different error codes (of the UDPOpen/Send functions).

Br, FireFox.


 

OS : Win XP SP2 (32 bits) / Win 7 SP1 (64 bits) / Win 8 (64 bits) | Autoit version: latest stable / beta.
Hardware : Intel(R) Core(TM) i5-2400 CPU @ 3.10Ghz / 8 GiB RAM DDR3.

My UDFs : Skype UDF | TrayIconEx UDF | GUI Panel UDF | Excel XML UDF | Is_Pressed_UDF

My Projects : YouTube Multi-downloader | FTP Easy-UP | Lock'n | WinKill | AVICapture | Skype TM | Tap Maker | ShellNew | Scriptner | Const Replacer | FT_Pocket | Chrome theme maker

My Examples : Capture toolIP Camera | Crosshair | Draw Captured Region | Picture Screensaver | Jscreenfix | Drivetemp | Picture viewer

My Snippets : Basic TCP | Systray_GetIconIndex | Intercept End task | Winpcap various | Advanced HotKeySet | Transparent Edit control

 

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You can use the Firewall UDF in my signature to check. You could always specifically open the ports, or use the _ListAuthorizedPorts function to display what is open or not.


"Profanity is the last vestige of the feeble mind. For the man who cannot express himself forcibly through intellect must do so through shock and awe" - Spencer W. Kimball

How to get your question answered on this forum!

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You can use the Firewall UDF in my signature to check. You could always specifically open the ports, or use the _ListAuthorizedPorts function to display what is open or not.

 

Thanks a lot

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Fast question:

To do this I don't actually have to use UDPSend() right? UDPOpen() should return an error right away if the port is closed, right?

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Try it:

UDPOpen(<IP Address>, <port>, 0)
   If $aArray[0] = 0 Then ; your code here
   ;-Or-
   If @error Then ;your code here

"Profanity is the last vestige of the feeble mind. For the man who cannot express himself forcibly through intellect must do so through shock and awe" - Spencer W. Kimball

How to get your question answered on this forum!

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