If you thinking Epson printer offline fix situation but it is switched on then there might be a problem with the connection.
If your printer is connected with an Ethernet cable then ensure that the cable is linked to the router and the printer. If you need an IP address then you can just take a print of the network configuration page for reference.
If you are using a USB cable then you should check if it is unfastened in any way or not. If you think that there is something wrong with the USB cable then you can also connect it openly instead of a hub.
If you have a wireless connection then you can use the network configuration page to acquire the IP address and certify that the printer and the system are both on the same wifi connection.