How to turn of firewall using C# code

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.NET3.5

Hello every one

I am working on a networking project . So in this project i am using sockets to carry data from one system to another . For this the "Fire wall " has to be turn Off else it wont accept data send by one system to another one . For that
i want to turn off firewall when my application starts and turn on it when application is closed . So how can i do it . I saw it net it can be done using register key (regedit) but i don't know to how to access register key using C# .
I tried using

C#

RegistryKey reg = new RegistryKey();

and fallowed by this path

C#

//HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfil\EnableFirewall=1

but it is showing error so can anybody can help me how to solve it . Even in code project i saw the same but the code is written in visual C++

Posted 7-Feb-12 17:12pm

arunrv

Updated 1-Apr-16 9:33am

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Member 12203827 6-Jun-16 2:52am

This worked perfectly for me!

I have a question, my users tell me they get not connected to server error, despite they are connected to internet. I'm not sure if the firewall is blocking access to internet or the anti-virus. In this case, I will disable their firewall when the application starts and re-enable the firewall when the application closes.

I was thinking it won't be necessary if my program gets added into firewall exception list.

Please tell me a way to do this.

Thanks.

2 solutions

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santhosh-padamatinti · Answer 1 · 2012-02-07T17:52:00

Solution 1

http://blogs.msdn.com/b/securitytools/archive/2009/08/21/automating-windows-firewall-settings-with-c.aspx[^]

Posted 7-Feb-12 17:52pm

santhosh-padamatinti

harsh varudkar · Answer 2 · 2014-03-31T09:13:00

1) first remember to add "app.manifest"(Project menu->Add New Item->Application Manifest file) in project and
2) add

<requestedexecutionlevel level="requireAdministrator" uiaccess="false" />

before "

</requestedPrivileges>

" tag.

XML

<trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
    <security>
      <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
        <!-- UAC Manifest Options
            If you want to change the Windows User Account Control level replace the
            requestedExecutionLevel node with one of the following.

        <requestedExecutionLevel  level="asInvoker" uiAccess="false" />
        <requestedExecutionLevel  level="requireAdministrator" uiAccess="false" />
        <requestedExecutionLevel  level="highestAvailable" uiAccess="false" />

            Specifying requestedExecutionLevel node will disable file and registry virtualization.
            If you want to utilize File and Registry Virtualization for backward
            compatibility then delete the requestedExecutionLevel node.
        -->
        <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
      </requestedPrivileges>
    </security>
  </trustInfo>

3) now in .cs file

4) add library file

using System.Diagnostics;

5) enable firewall of system

C#

private void btnfire_Click(object sender, EventArgs e)
        {
            try
            {
                Process proc = new Process();
                string top = "netsh.exe";
                proc.StartInfo.Arguments = "Firewall set opmode enable";
                proc.StartInfo.FileName = top;
                proc.StartInfo.UseShellExecute = false;
                proc.StartInfo.RedirectStandardOutput = true;
                proc.StartInfo.CreateNoWindow = true;
                proc.Start();
                proc.WaitForExit();
                MessageBox.Show("Enable");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error");
            }
        }

6)disable firewall of system

C#

private void button5_Click(object sender, EventArgs e)
        {
            try
            {
                Process proc = new Process();
                string top = "netsh.exe";
                proc.StartInfo.Arguments = "Firewall set opmode disable";
                proc.StartInfo.FileName = top;
                proc.StartInfo.UseShellExecute = false;
                proc.StartInfo.RedirectStandardOutput = true;
                proc.StartInfo.CreateNoWindow = true;
                proc.Start();
                proc.WaitForExit();
                MessageBox.Show("Disable");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error");
            }
        }

"