iscsi target issue

I've retired a problematic iSCSI from a PVE system and now I can't seem to remove it from the configuration, via the web UI itself - it always shows up as "offline" - ie. "storage 'XYZ' is not online (500)". How can I remove this from all configurations?

Hallo zusammen, ich grübel nun seit ein paar Stunden über folgende Logfile Einträge auf meinem ISCSI Target: Nov 17 23:24:21 targethost kernel: [ 2522.253502] rx_data returned 0, expecting 48. Nov 17 23:24:21 targethost kernel: [ 2522.256110] iSCSI Login negotiation failed. Je länger man...