After we upgraded 2 Cisco Switches: 15.2(3)E1 WS-C2960X-48FPS-L15.2(4)E1 WS-C2960X-48LPS-L With the firmware c2960x-universalk9-tar.152-7.E One of them (48FPS-L) with the older firmware threw the error ILET-1-AUTHENTICATION_FAIL (Informing me that th...

Our Previous environment: We are connected through the Gov. Sector through the MPLS line. Our main switch ‘SG300-52 52-Port Gigabit Managed Switch’ is connected to the Gov.’s WS-C3560X-24P Switch from which we are able to access internet for our inte...