NIC port "no carrier"

Using TrueNAS (fresh install) and using a private based subnet for intranet connectivity from local hosting servers to NAS: 10.0.100.0/24 is the subnet.

I have 3 servers (AlmaLinux 8.8) configured with cPanel and CSF firewall. Each of the 3 servers is assigned a unique IP from the 10.0.100.0/24 subnet

Server 1: 10.0.100.3 (main server in this ticket)

Server 2: 10.0.100.4 (cPanel shared server)

Server 3: 10.0.100.5 (cPanel reseller server)

NAS: 10.0.100.2 private

Connection problems:

Server 1 to NAS: not working

Server 2 to NAS: working

Server 3 to NAS: working

Error Message:

Error: Validation for transport iNASi failed: Cannot connect to i10.0.100.2i.

Troubleshooting:

1. Hardware & software are 100% identical on each of 3 servers, aside unique private IP address.

2. Flushed CSF firewall on 3 servers and restarted networking.

3. Whitelisted NAS public main IP on 3 servers

4. Whitelisted 10.0.100.0/24 on all 3 servers

5. Direct FTP access (main public IP) for each 3 usernames created on NAS and used on 3 cPanel servers all work fine.

6. Passive FTP enabled on NAS and also 3 server's backup config

7. Ethernet cables are all secued and clicked in, NIC port lights flashing fine and "ip a" output shows assigned subnet on secondary NIC on each of the 3 servers

8. Temporarily disabled CSF firewall and cPHulk

This is what I noticed, out of the 3 servers the probelmatic server shows "no carrier" on 2nd NIC assigned for private subnet.

Code:4: ens2f1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether a0:36:9f:7b:00:6e brd ff:ff:ff:ff:ff:ff
altname enp94s0f1
inet 10.0.100.3/24 brd 10.0.100.255 scope global ens2f1
valid_lft forever preferred_lft foreverI tried:

Code:[root@server ~]# ifconfig ens2f1 down
[root@server ~]# ifconfig ens2f1 upStill shows no carrier. Not sure why.