Logs show the following error message: "License Manager SSL connection failed - Please check your Internet connection and DNS settings."
You might encounter situations when the SMA cannot contact the license manager server.
This can cause registration issues or problems with the licenses not being synchronized correctly. This KB article outlines some steps you can follow that may help to isolate and solve this kind of issues:
Verify that the IP address of the default gateway and the selected outgoing interface are correct from Network | Routes | Default IPv4 Gateway. You can test the connection by pinging the default gateway from System > Diagnostics > select Ping and type the IP address of your default gateway. Also from Network > Routes, check that there is not a static route created that could be routing that traffic through an undesired path.
Check that the DNS settings of the SMA are correct inside Network > DNS. The SMA must be able to communicate with the configured DNS servers. You can test the connection by pinging the DNS servers following the same steps described above.
Please do a TCP connection test to licensemanager.sonicwall.com and lm2.sonicwall.com by going to System > Diagnostics > TCP connection test and type “licensemanager.sonicwall.com”. Ensure that lm2.sonicwall.com and licensemanager.sonicwall.com is reachable on both port 80 and 443.
If you are still getting the same error message, even when the TCP connection is not being blocked by an upstream firewall, check that the size of RSA public key of the SMA certificate is at least 2048 bits. SonicWall License Manager no longer supports 1024-bit RSA certificates. If you are using an old firmware version and the self-signed certificate uses a 1024-bit public key, upgrading to a current firmware version should solve the issue.
Also, check upstream firewall is blocking traffic to licensemanager.