I have a simple network for a retail shop. I am using a Sonicwall TZ300 router/firewall with a powerconnect 6248 switch. As well as a TP Link 8 port POE switch for my wifi nodes. The network suddenly went down yesterday and there was no connection to the internet. As trouble shooting I found that the TP-link switch communicates to the Sonic Wall fine if I unplug the 6248. When I plug in the 6248 I lose internet. I have migrated the mission critical network connections to the TP-Link we we are still in business, but I'd like to know what to do with the 6248. It was working fine prior. It is a used switch and I don't know how to access it's management features. It powers up fine.
Any help is appreciated.