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# Known issues for firewalls

In this topic:

## Checking connectivity

To run Vusers or monitor servers over a firewall, you must be able to establish a connection between the OpenText Professional Performance Engineering Agent, the MI Listener, and the Controller machine.

If you encounter connectivity problems after installing and configuring all the necessary components, check the table below for troubleshooting tips.

Check | Action
--- | ---
Make sure the firewall service is activated on the agent machine. | On the machine running/monitoring Vusers over a firewall, the agent icon should display a red light icon . If the icon does not have a light icon, it means FirewallServiceActive=1 is not set in the [FireWall] section of the Agent Settings. See Agent Configuration Settings dialog box.
Make sure port 443 is open. | On the agent machine, open a Command Prompt window, and enter: `telnet <MI_Listener_IP>443` For example: `telnet 111.111.111.1111 443``` If port 443 is open, a new Telnet window opens. If port 443 is not open, contact your network administrator.
Make sure port 443 is available. | If a web server is running on the MI Listener or MOFW machine, port 443 does not allow the access required by the listening and monitoring processes. Contact your network administrator to change the web server port.
Confirm connectivity between the agent and the MI Listener when running the agent as a service. | If the agent icon has a red light when running the agent as a service, do the following: Make sure port 443 is open. See the troubleshooting tip above. Make sure the Agent Settings and Agent Configuration are correctly set. See Agent Configuration Settings dialog box. Start the agent as a process by running <installdir>\Launch_service\bin\magentproc.exe If you can run the agent as a process, there is an authentication issue with the Load Testing Agent Service. Browse to Service > OpenText Professional Performance Engineering Agent Service, and change the properties of this service to `System User Account`. Alternately, provide the user name and password of someone who has administrative privileges on this machine.
Confirm connectivity between the agent and Controller when monitoring over a firewall. | Make sure you entered the servers that you want to monitor in the Monitor Configuration dialog box. See Set firewall monitoring preferences. Start the agent process on the MOFW machine. (See Configure the agent over firewalls.) On Controller, enter the name of the MOFW machine in the Load Generators dialog box, and click Connect. After about a minute, data from the MOFW machine starts streaming to Controller through the MI Listener. (See Set firewall monitoring preferences.) If no data arrives at Controller, try connecting Controller to the MI Listener as if the Listener is a load generator. This helps to identify the cause of the problem. Right-click the agent icon, and examine the log file on the MOFW machine. There should be no error messages. Start the MI Listener, and then manually start the agent process by running <installation>\launch_servicebin\magnetproc.exe on the MOFW machine. Allow the MOFW machine sufficient time to connect to the MI Listener, then connect Controller to the MOFW machine. If the agent process crashes, either restart the agent or reboot the MOFW machine.

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## Windows Firewall considerations

In most Windows environments, Windows Firewall is turned on by default. The firewall can prevent certain OpenText Professional Performance Engineering components from communicating with each other. Windows Firewall therefore needs to be turned off.

Note: Turning off Windows Firewall can increase the risk to your computer's security.

For each process that needs Windows Firewall, you can unblock the process in one of the following ways:

- In the popup window indicating that the current program is blocked by Windows Firewall, click the unblock button.

- Manually configure the Windows Firewall in the Exceptions tab.

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## Agent on Linux

To configure the agent on Linux, run the agent_config script. For details, see Configure the agent over firewalls. If the menu does not display, type the following command to check if the M_LROOT environment variable is set:

    echo $M_LROOT

If M_LROOT is not set, do either of the following:

- Type `sudo su -` to inherit all environment variables of the current user.
- Type `source <LoadGenerator_directory>/env.sh` to set all the load generator-related environment variables after switching to root (that is, "sudo su").

Note: This limitation occurs on Amazon cloud Linux machines, usually when you log in to the system using the special user named "ec2-user".

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