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are there some kind of VLAN configuration at the switch?<br />
or more likely a LACP / Interface-HA / Interface-failover configuration?<br />
If both SFP + ports use different port numbers, then &quot;only one at a time active&quot; should not happen
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are there some kind of VLAN configuration at the switch?
or more likely a LACP / Interface-HA / Interface-failover configuration?
If both SFP + ports use different port numbers, then "only one at a time active" should not happen

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This does sound like you have link aggregation (or similar) on those ports. &nbsp;In such a configuration you can not connect the two ports to different targets.<br />
<br />
Start by removing any existing configurations on those ports. Start building from there.
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This does sound like you have link aggregation (or similar) on those ports.  In such a configuration you can not connect the two ports to different targets.

Start by removing any existing configurations on those ports. Start building from there.

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I have a unifi us-48 port switch <br />
I have removed all connections to the switches and connected a pc and two servers to the switch.<br />
<br />
Each server into the SFP+ ports<br />
They can both ping the switch IP, the PC but not each other.<br />
<br />
I have opened two command prompts on the PC and tried to ping each server in a different window.<br />
If you get a reply from one server the other drops.<br />
It looks like only one SFP+ port can be active at a time.<br />
<br />
I need them both to be fully available on the network all the time.<br />
Any ideas ?
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I have a unifi us-48 port switch 
I have removed all connections to the switches and connected a pc and two servers to the switch.

Each server into the SFP+ ports
They can both ping the switch IP, the PC but not each other.

I have opened two command prompts on the PC and tried to ping each server in a different window.
If you get a reply from one server the other drops.
It looks like only one SFP+ port can be active at a time.

I need them both to be fully available on the network all the time.
Any ideas ?

Problem when using both SFP+ ports on Unifi switch

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.