28 Tex. Admin. Code § 7.1409
If a court of competent jurisdiction has appointed the liquidator as receiver of any person, insurer, or other entity, service of process with respect to that person, insurer, or other entity must be made on the person designated liquidator as receiver. This service of process has no effect if it is made on the commissioner or the secretary of state. Furthermore, if service is made upon the commissioner under these circumstances, it will be returned in the manner described in § 7.1404(e) of this title (relating to Service of Process Procedure for Domestic Insurers Approved To Operate under the Insurance Code, Article 1.28, Foreign and Alien Insurance Companies, Risk Retention Groups, Purchasing Groups, Third Party Administrators, Unauthorized Persons or Insurers, Organizations Formed under the Insurance Code, Article 3.71, and Surplus Lines Insurers).
28 Tex. Admin. Code § 7.1409