@Nenad-Vie Update! @Clive_A your message has helped me to solve my problem, I can now use the Gigabit ports 25 - 28. 1) Your hint that the ports do not have to be defective helped me, which gave me a...

@Clive_A Thank you for your Answer! I have done everything except for reseting the switch, including what was described in the links. I have a DHCP configuration for the VLAN for the Gigabit port. I...

Hi! As I could not find a question in the existing entries that would help me, I have opened a new thread. I have a TL-SL2428P switch. This switch has 4 Gigabit ports. I am not able to use these...