I have an issue on ceph-iscsi ( ubuntu 20 LTS and Ceph 15.2.6) after I restart rbd-target-api, it fails and not starting again:
```
sudo systemctl status rbd-target-api.service
● rbd-target-api.service - Ceph iscsi target configuration API
Loaded: loaded (/lib/systemd/system/rbd-target-api.service; enabled; vendor preset: enabled)
Active: deactivating (stop-sigterm) since Sat 2020-11-28 17:01:40 +0330; 20s ago
Main PID: 37651 (rbd-target-api)
Tasks: 55 (limit: 9451)
Memory: 141.4M
CGroup: /system.slice/rbd-target-api.service
├─15289 /usr/bin/python3 /usr/bin/rbd-target-api
└─37651 /usr/bin/python3 /usr/bin/rbd-target-api
Nov 28 14:36:53 dev11 systemd[1]: Started Ceph iscsi target configuration API.
Nov 28 14:36:54 dev11 rbd-target-api[37651]: Started the configuration object watcher
Nov 28 14:36:54 dev11 rbd-target-api[37651]: Processing osd blacklist entries for this node
Nov 28 14:36:54 dev11 rbd-target-api[37651]: Checking for config object changes every 1s
Nov 28 14:36:55 dev11 rbd-target-api[37651]: Reading the configuration object to update local LIO configuration
Nov 28 14:36:55 dev11 rbd-target-api[37651]: Processing Gateway configuration
Nov 28 14:36:55 dev11 rbd-target-api[37651]: Setting up iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 14:36:55 dev11 rbd-target-api[37651]: (Gateway.load_config) successfully loaded existing target definition
Nov 28 17:01:40 dev11 systemd[1]: Stopping Ceph iscsi target configuration API...
```
journalctl:
```
Nov 28 17:00:01 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:01 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:04 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:04 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:06 dev11 ceph-mgr[3184]: [172.16.1.3:57002] [GET] [500] [45.074s] [admin] [513.0B] /api/health/minimal
Nov 28 17:00:06 dev11 ceph-mgr[3184]: [b'{"status": "500 Internal Server Error", "detail": "The server encountered an unexpected condition which prevented it from fulfilling the request.", "request_id": "68eed46b-3ece-4e60-bc17-a172358f2d76"} ']
Nov 28 17:00:06 dev11 ceph-mgr[3184]: [172.16.1.3:60128] [GET] [500] [45.070s] [admin] [513.0B] /api/health/minimal
Nov 28 17:00:06 dev11 ceph-mgr[3184]: [b'{"status": "500 Internal Server Error", "detail": "The server encountered an unexpected condition which prevented it from fulfilling the request.", "request_id": "5b6fdaa2-dc70-48a7-b01f-ca554ecfec41"} ']
Nov 28 17:00:07 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:07 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:11 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:11 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:11 dev11 ceph-mgr[3184]: ::ffff:127.0.0.1 - - [28/Nov/2020:17:00:11] "GET /metrics HTTP/1.1" 200 151419 "" "Prometheus/2.7.2"
Nov 28 17:00:14 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:14 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:17 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:17 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:20 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:20 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:22 dev11 ceph-mgr[3184]: [172.16.1.3:59834] [GET] [500] [45.062s] [admin] [513.0B] /api/health/minimal
Nov 28 17:00:22 dev11 ceph-mgr[3184]: [b'{"status": "500 Internal Server Error", "detail": "The server encountered an unexpected condition which prevented it from fulfilling the request.", "request_id": "1ba61331-1dfd-43e7-8ced-9f28aeb8a39c"} ']
Nov 28 17:00:23 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:23 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:26 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:26 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:26 dev11 ceph-mgr[3184]: ::ffff:127.0.0.1 - - [28/Nov/2020:17:00:26] "GET /metrics HTTP/1.1" 200 151420 "" "Prometheus/2.7.2"
Nov 28 17:00:27 dev11 ceph-mgr[3184]: [172.16.1.3:60132] [GET] [500] [45.081s] [admin] [513.0B] /api/health/minimal
Nov 28 17:00:27 dev11 ceph-mgr[3184]: [b'{"status": "500 Internal Server Error", "detail": "The server encountered an unexpected condition which prevented it from fulfilling the request.", "request_id": "9c1dd49b-07fb-4c49-a033-f5d8d82d9cbe"} ']
Nov 28 17:00:29 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:29 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:32 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:32 dev11 kernel: iSCSI Login negotiation failed.
Nov 28 17:00:35 dev11 kernel: Unable to locate Target Portal Group on iqn.2003-01.com.redhat.iscsi-gw:iscsi-igw
Nov 28 17:00:35 dev11 kernel: iSCSI Login negotiation failed.
```
What should I do for this problem?
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