Hi, Din!
If the direct connection from the server to the storage fails, I guess that the physical link is abnormal.
You can do as follows to check it.
1. Check if the flexible nic of 1288H V5 is working at 10 GB by clicking here.
2. Check if the working mode is matched with the server by clicking here.
If they could not solve your problem, please send photos of the fibre modules and boards to me.
Thank you!