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Configuring the Windows Firewall

The Microsoft Internet Connection Firewall allows users to prevent unauthorized applications from accessing your computer using communication ports into your computer.

In order for ClockWatch to communicate with timeservers you must allow communication with the specified servers using the ports specified.

This describes how to configure the Windows firewall to allow time protocol communication messages such as NTP and NIST between external timeservers and ClockWatch.

Windows XP
Windows Vista
Windows 7

Windows 8


Windows XP
Starting with Windows XP Service Pack 2 Microsoft offered an enhanced firewall that restricts communication to external sites. These restrictions may interfere with the normal operation of time synchronization products. You then must explicitly allow communication through the ports used in communicating with external timeservers.


You must allow exceptions if your firewall is on
 

Open the firewall control panel.

To open Windows Firewall, click Start, click Control Panel, and then double-click Windows Firewall.

 Confirm that exceptions are allowed, so the settings are set like this


Note that we have already allowed the ClockWatch Application and Service. In many ways this is a simpler way to allow the ClockWatch timeserver to work.

On the Exception tab click on 'Add Port'

An alternative method would be click on the 'Add Program' to select the ClockWatch application and ClockWatch Service.

 


In this example we are adding a setting to allow NTP over port 123 using the UDP communication protocol.

Name: Identify the port with the time protocol in use (NTP, SNTP, NIST, Daytime or Time)

Port number, is based on the protocol used:

  • NTP and SNTP use  port 123 on time servers.
  • NIST and Daytime use port 13
  • Time uses port 37

Communication protocol, is also dictated by the time protocol in use:

  • NTP and SNTP use User Datagram Protocol (UDP) for communication.
  • NIST and Daytime  use TCP
  • Time uses either TCP or UDP


NTP time protocol communication is now permitted

Press OK,  and NTP should be now be allowed through the firewall.

Windows Vista/Windows 7/8

This will show you how to add or remove ClockWatch as a Windows Firewall program exception for each type of network location (ex: Private or Public) that you use in Windows 7/8.  Note that there are two components in ClockWatch that may require access through the firewall, the ClockWatch application (ClockWatch.exe) and the ClockWatch Service (CWSrvc.exe)

How to Add a Windows Firewall Rule in Windows 7/8
1. Open the Control Panel
(All Items View).

2. Click on the Windows Firewall icon.

3. Click on the Allow a program through Windows Firewall link in the left blue pane.



 

4. Click on the Change Settings button.


5. Create or Modify an Inbound Rule
On the left side, click the Inbound Rules section. This will show a list of programs that have access (or have tried to communicate) through the firewall.


 

6. To Add a Rule and Allow Communication

If ClockWatch is Listed as a rule -
Click on the program name (ClockWatch set time utility or ClockWatch Service Module) to open the properties screen.
 
  • Click on the Allow the connection radio button.
  • Verify the Protocol and Ports Settings (below)
     
Check the Protocol and Ports tab    
Ports are openings thought the firewall used for communication. ClockWatch communicates to a timeserver using a predetermined data exchange, called a protocol.

Protocol and Ports: Select the protocol and port with the time protocol in use (NTP, SNTP, NIST, Daytime or Time)

Protocol type, is determined by the time protocol in use:

  • NTP and SNTP use User Datagram Protocol (UDP) for communication.
  • NIST and Daytime  use TCP
  • Time uses either TCP or UDP

Local and Remote Port number, is based on the protocol used. Select All Ports or you can specify the individual ports used.

  • NTP and SNTP use  port 123 on time servers.
  • NIST and Daytime use port 13
  • Time uses port 37

 

     
If ClockWatch is not Listed as a rule    
  • Click on the New Rule button on the right pane.
  • Select Program
  • Click on the Browse button. Navigate to the program's exe file location, usually in a C:\Program Files\Beagle Software\ClockWatch folder, click on the ClockWatch.exe file to select the application or CWSrvc.exe to select the service. Click on the Open button.
  • Check Domain, Private and Public to permit communication over the Internet and the LAN
  • Give a descriptive name to the Rule, (i.e.. ClockWatch Service)
  • Verify the Protocol and Ports settings of the newly created rule (above)

 

     

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Copyright 2012 Beagle Software. All rights reserved
Last reviewed April 06, 2012