We use a proxy server, but when we enter the license, error is occurring

To activate a license via proxy server you need to specify the Proxy server in the Web.Config file of your Central Administration web application virtual directory using the System.Net element. The steps for that are:

1) Open up the web.config file.
2) Look for the .xml node < system.net >.
3) There should be a < defaultProxy > xml node inside < system.net >. If not, create it.
4) There should be a < proxy > xml node inside < defaultProxy >. If not, create it.
5) If you have an autoDetect="True" attribute, remove it.
6) Add the following attributes to the < proxy > xml node
proxyaddress="http://proxy.company.com:8080"
bypassonlocal="true"
7) Save the web.config file.


Note: If the proxy server requires authentication you should use "useDefaultCredentials" parameter for passing an authentication.
Here is an example:

< defaultProxy enabled="true" useDefaultCredentials="true" >
< proxy bypassonlocal="True" proxyaddress="http://yourproxy"/ >
< /defaultProxy >