--> I got this problem when I inserted new SFP in Dell Sonicwall and connected cable to the Cisco switch, LED was glowing on both Cisco Switch and Dell Sonicwall Firewall.
--> But On the Management Page of Dell Sonicwall, it was showing No link.
--> To solve this problem, First, we need to check whether the interfaces are working properly or not. In order to check we need to do loopback test on Dell Sonicwall.
--> Just connect the cable on the Interface which is not working to any unused interface on Dell Sonicwall Firewall.
--> If LED's are active on both the interfaces then Interfaces are working properly.
--> So simply we need restart the firewall to show cable is connected to the interface on the Management web page.
--> If after restart also is not working then contact Dell Support :)
--> But On the Management Page of Dell Sonicwall, it was showing No link.
--> To solve this problem, First, we need to check whether the interfaces are working properly or not. In order to check we need to do loopback test on Dell Sonicwall.
--> Just connect the cable on the Interface which is not working to any unused interface on Dell Sonicwall Firewall.
--> If LED's are active on both the interfaces then Interfaces are working properly.
--> So simply we need restart the firewall to show cable is connected to the interface on the Management web page.
--> If after restart also is not working then contact Dell Support :)
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