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I want to block a port for a specific time duration, say 1 am to 3 am. I can add a rule to built in firewall but this blocks the port all the time. Is there any way to do this for only a specif period of time ?

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No. It is not doable unless you make your own VBS script to automate with Task Scheduler. For which you need to implement Windows Firewall API. If oyu make a script post it. It would be of immense help to others.

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+1 for controlling with Task Manager suggestion. It doesn't need to be VBS script though, PowerShell scripting would work, but easiest may be to use a couple batch files and Windows' netsh command. – Ƭᴇcʜιᴇ007 Aug 19 '12 at 15:48

Finally I found a solution. First add a rule to block desired application in the firewall. Then the rule can be enabled or disabled using the command:

netsh advfirewall firewall set rule name="MyRule" new enable=yes

This can be added to a script that periodically checks time and enables/disables MuRule accordingly. I could not find sleep command in batch script and I don't know PowerShell so I wrote a simple c++ program.

using namespace std;

int main()
{//code for hiding console
    HWND window; 
    window = FindWindowA("ConsoleWindowClass", NULL);

    Sleep(60*1000);// 1 min delay
    time_t now;
    struct tm *current;
    now = time(0);
    current = localtime(&now);
    if(current->tm_hour>=22||current->tm_hour<=6) // 10 pm to 6 am
        system ("netsh advfirewall firewall set rule name=\"MyRule\" new enable=yes");
        system ("netsh advfirewall firewall set rule name=\"MyRule\" new enable=no");
    Sleep(10*60*1000);// 10 min delay
    return 0;

Compile using gcc and run at logon using Task Scheduler with Admin Privilege.

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I think there's some inconsistancy between 'MyRule' "MuRule" and "Murule" there. I'm not sure tho, I don't read C well enough – Journeyman Geek Oct 2 '12 at 11:38
Corrected. I had different name in original program. Made mistake while changing name. – Serious Oct 2 '12 at 11:47

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