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Please go through the checklist below:

1. Checking the V-Ray license server:

   Please restart the machine with the V-Ray license server or dongle installed.
   
   If you are using a Remote server, please check if the IP address of the remote server is correct.
   
   If you are using a dongle, unplug the dongle and plug it again in a different USB port, preferably USB 2.0. Make sure that Windows properly recognizes the dongle and doesn't show an error message. If you receive an error message, please refer to V-Ray License Server Can't Start in this section.

   
   Open the link http://localhost:30304 in a web browser on the same machine. If it looks like the screenshot below, the license server is working.
   
   

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2. Checking the available licenses on the license server:
   
   Check the available licenses. You have to have proper licenses for the installed V-Ray version, e.g. if you installed V-Ray Next for Maya, you need a V-Ray Next for Maya license. You can check that by entering the respective V-Ray option on the http://localhost:30304 page. You can see all available render nodes and interface licenses, as well as check the borrowed ones.
   
   

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If you are running a Chaos license on a separate machine, please refer to the Manually Change Changing the Product License Server IPSetup page for more information on how to help V-Ray locate your server. 

1. Checking the connection to the license server:

   If V-Ray is on the same machine as the V-Ray license server, you can skip this step.

   To make sure that nothing is blocking the connection to the license server on the machine where you want to run V-Ray, open the link http://<IP_address> :30304 in a web browser, where <IP_address> is the IP address of the machine with the V-Ray license server. If you get a web page like the one below, V-Ray can access the V-Ray license server from this machine. In the example screenshot, the IP address of the machine with the license server is 10.0.0.107
   
   

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   If you get an error message that the web page can't be accessed, then there is a network problem that prevents the connection to the V-Ray license server. If you have any firewall or antivirus software running on your machines, make sure they are not blocking applications' access to the network or blocking the communication on TCP/IP port 30304. Please contact your system administrator for more information.
   
   

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   Column width 55% 4. Checking the V-Ray license settings On the machine where you want to use V-Ray, run the V-Ray license client configuration utility from Windows Start > All Programs > Chaos Group > V-Ray for Maya 20xx for x64 > Change license settings. In the dialog that appears, make sure that the IP address in the License server field at the Primary license server tab is entered correctly and that the connection port is 30304. If you modify any of these settings, you will need to restart Maya. Note: If the V-Ray license server is running on the same machine as V-Ray, you can use localhost or 127.0.0.1 in the License server field. Column width 5% Column width 40%

Please go through the checklist below:

1. Checking the V-Ray license server:

   Please restart the machine with the V-Ray license server or dongle installed.
   
   If you are using a Remote server, please check if the IP address of the remote server is correct. 
   
   If you are using a dongle, unplug the dongle and plug it in again in a different USB port, preferably USB 2.0. Make sure that the operating system properly recognizes the dongle. Make sure that the V-Ray license service is running; if you have issues refer to V-Ray License Server Can't Start in this section.  

   
   

   Open the link http://localhost:30304 in a web browser on the same machine. If it looks like the screenshot below, the license server is working.
   
   

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1. Checking the available licenses on the license server: 
   
   Check the available licenses. You have to have proper licenses for the installed V-Ray version, e.g., if you installed V-Ray Next for Maya, you need V-Ray Next for Maya license. You can check that by entering the respective V-Ray option on the http://localhost:30304 page. You can see all available render nodes and interface licenses, as well as check the borrowed ones.
   
   

   Section
   Column width 20% Column width 55% Column width 25%

If you are running a Chaos license on a separate machine, please refer to the Manually Change Changing the Product License Server IPSetup page for more information on how to help V-Ray locate your server. 

1. Checking the connection to the license server: 
   
   If V-Ray is on the same machine as the V-Ray license server,  you can skip this step. To make sure that nothing is blocking the connection to the license server on the machine where you want to run V-Ray, open the link http://<IP_address> :30304 in a web browser, where <IP_address> is the IP address of the machine with the V-Ray license server. If you get a web page like the one below, V-Ray can access the V-Ray license server from this machine. In the example screenshot, the IP address of the machine with the license server is 10.0.3.104
   
   

   Section
   Column width 20% Column width 50% Column width 25%

   
   

   If you get an error message that the web page can't be accessed, then there is a network problem that prevents the connection to the V-Ray license server. If you have any firewall or antivirus software running on your machines, make sure they are not blocking applications' access to the network or blocking the communication on TCP/IP port 30304. Please contact your system administrator for more information. 

   
   
   

   
   

2. Checking that the license server settings are correct.
   
   In the Terminal run /Applications/Autodesk/maya20xx/vray/bin/setvrlservice -dump
   
   where 20xx is the particular version of Maya you are using (2018, etc). This will show you the IP address or the name of the computer that V-Ray is trying to connect to. If it's incorrect, refer to the Manually Change Changing the Product License Server IPSetuppage.

Please go through the checklist below:

1. Checking the V-Ray license server:
   
   Please restart the machine with the V-Ray license server or dongle installed.
   
   If you are using a Remote server, please check if the IP address of the remote server is correct. 
   
   If you are using a dongle, unplug the dongle and plug it in again in a different USB port, preferably USB 2.0. Make sure that the operating system properly recognizes the dongle. Make sure that the V-Ray license service is running.
   
   Open the link http://localhost:30304 in a web browser on the same machine. If it looks like the screenshot below, the license server is working.
   
   

   Section
   Column width 25% Column width 50% Column width 25%

1. Checking the available licenses on the license server: 
   
   Check the available licenses. You have to have proper licenses for the installed V-Ray version; e.g., if you installed V-Ray Next for Maya, you need V-Ray Next for Maya license. You can check that by entering the respective V-Ray option on the http://localhost:30304 page. You can see all available render nodes and interface licenses, as well as check the borrowed ones.
   
   

   Section
   Column width 25% Column width 50% Column width 25%

If you are running a Chaos license on a separate machine, please refer to the Manually Change Changing the Product License Server IPSetup page for more information on how to help V-Ray locate your server. 

1. Checking the connection to the license server:
   
   If V-Ray is on the same machine as the V-Ray license server, you can skip this step.
   To make sure that nothing is blocking the connection to the license server on the machine where you want to run V-Ray, open the link http://<IP_address> :30304 in a web browser, where <IP_address> is the IP address of the machine with the V-Ray license server. If you get a web page like the one below, V-Ray can access the V-Ray license server from this machine. In the example screenshot, the IP address of the machine with the license server is 10.0.3.104
   
   

   Section
   Column width 25% Column width 50% Column width 25%

   
   If you get an error message that the web page can't be accessed, then there is a network problem that prevents the connection to the V-Ray license server. If you have any firewall or antivirus software running on your machines, make sure they are not blocking the applications' access to the network or blocking the communication on TCP/IP port 30304. Please contact your system administrator for more information.
   
   
   

2. Checking that the license server settings are correct.
   
   In the Terminal run /usr/autodesk/maya20XX-x64/vray/bin/setvrlservice -dump
   
   where 20xx is the particular version of Maya you are using (2018, etc). This will show you the IP address or the name of the computer that V-Ray is trying to connect to. If it's incorrect, refer to the Manually Change Changing the Product License Server IPSetuppage.