I've been having some ongoing issues with my iSCSI connection not reconnecting itself after the server reboots, as shown below:
OS is Windows Server 2008 R2. The iSCSI device is for my SQL Server 2008 R2 instance that is in a failover cluster with another identical server. Both servers exhibit the same problem.
The target is listed as a "favorite target" and requires no authentication. Digests are turned off. The iSCSI target is exposed via a Synology NAS device.
It's also worth mentioning that my file/print servers (same OS) exhibit the same problem. I've tried doing research myself but there hasn't been much help so far. This is a very basic setup and most solutions assume a more SAN-like configuration.
All server except the NAS are on ESXi 6 hosts (one VM in the pair on each host).
Edit: Discovery tab:
Update: Log messages: