How to solve these errors with the connection with the storage system?

Question

iSCSI

I'll tell you right away.
Never encountered such things.
There is a server, there is a storage system (IBM Storewize V3700). Connected via Fiber Channel.
I did everything according to the instructions off, everything works. Disks are visible, you can go to them. For the time being .....
After rebooting the server, the storage system falls off. You can access the web interface.
In the server logs:
1. An error occurred while processing the iSCSI login request. The request was not resubmitted. The error status is indicated in the dump data.
2. The initiator failed to connect to the target. The destination IP address and TCP port number are contained in the dump data.
3. iSCSI discovery via SendTargets failed, error code 0xefff0003 for target portal *192.168.*.* 0003260 ROOT\ISCSIPRT\0000_0 .
In the storage logs:

I know how to use Google, Yandex. All I found is not clear answers with broken links.
There is only one solution:
Turn off the storage system, pull out the "controller", twist it in your hands, insert it back.
Any ideas? Maybe a service is down? Found services mentioning iSCSI - reboot does not help.
Maybe the brains of the storage system are leaking? I don't know how to diagnose. To hand over to any office, there is no possibility.

Answer 1

Someone is confused in the testimony. If the storage is connected via FC, then where are the errors on iSCSI from? Hint: Optical links between storage and servers are not yet FC. FC is a specific exchange protocol that requires special SFP modules and often specific FC switches. So figure out first what kind of transport you have - FC or still an IP network in terms of optics, and as an iSCSI transport. Because the servers complain to you about one thing, and the store complains about another, and these things do not intersect at all in real life.