pe="number"
            name="port"
            formControlName="port"
            i18n-placeholder
            placeholder="Port"
            (change)="checkPortMapping(i)"
            [required]="isFirst(i)"
          />
          <mat-error
            *ngIf="portMapping.get('port').errors?.kdValidInteger"
            i18n
          >
            Port must be an integer.
          </mat-error>
          <mat-error
            *ngIf="portMapping.get('port').errors?.required"
            i18n
          >
 