vCenterの接続が拒否されたために、NullPointerExceptionでSCV検出ジョブが失敗します

環境

問題

• バックアップジョブが次のエラーで失敗する：

Unable to discover resources on SCV: Storage discovery failed, received error during operation: java.lang.NullPointerException. Please refer to operation logs for more details.

• vmcontrol_<JOB_ID>.log エラーを表示します。

DEBUG <SCV host> --- [p250075633-3450] c.n.a.v.VsphereService           : [JobId:<JOB_ID>] NVPF vSphere session is NULL, can't get vSphere service instance using null session!
DEBUG <SCV host> --- [p250075633-3450] c.n.a.m.DatastoreStorageDetailsCache    : JobId + <JOB_ID> count reduced to 0, removing from cache
ERROR <SCV host> --- [p250075633-3450] c.n.a.s.p.DiscoverResourcesManager     : [JobId:<JOB_ID>] Storage discovery failed, received error during operation: java.lang.NullPointerException. Please refer to operation logs for more details.

• vmcontrol.log エラーを表示します。

DEBUG <SCV host> --- [p250075633-3450] c.n.a.v.VsphereService           : vSphereServiceURL is : https://<VCENTER>:443/sdk
DEBUG <SCV host> --- [p250075633-3450] c.n.a.v.VsphereService           : VI SDK invoke exception:java.net.ConnectException: Connection refused (Connection refused)
ERROR <SCV host> --- [p250075633-3450] c.n.a.s.p.DiscoverResourcesManager     : VI SDK invoke exception:java.net.ConnectException: Connection refused (Connection refused)