your SSL certificate has expired because one intermediary certficate ended in May, can you please update it, otherwise we can't use your WMS services, here is the outdated on :

Common name: USERTrust RSA Certification Authority
Organization: The USERTRUST Network
Location: Jersey City, New Jersey, US
Valid from May 30, 2000 to May 30, 2020
Serial Number: 13ea28705bf4eced0c36630980614336
Signature Algorithm: sha384WithRSAEncryption
Issuer: AddTrust External CA Root