     *ngIf="portMapping.get('protocol').errors?.required"
            i18n
          >
            Protocol is required.
          </mat-error>
          <mat-error
            *ngIf="portMapping.get('protocol').errors?.validProtocol"
            i18n
          >
            Invalid protocol.
          </mat-error>
        </mat-form-field>

        <div fxFlex="10">
          <button
            mat-icon-button
            *ngIf="isRemovable(i)"
            (click)="remove(i)"
          >
            <mat-