For general information about PY-GB-related certificates, go to Wiki page PY-GB and HMRC Certificates
How to check certificates loaded into PI systems having only a Java stack
Transaction STRUST cannot be used as this type of system does not have an ABAP stack.
Follow the below steps:
1) Open the SAP NetWeaver Administrator webpage of your PI system and log in. The format of the URL should be: “[PI server’s root link]/nwa”.
Click on ‘Key Storage’:
2) You get to the "Certificates and Keys: Key Storage' page:
3) Double click on relevant certificate to see its details on the bottom of the page:
Make sure the latest certificate is loaded. Downloading it does not require any special methods – see the ‘Resolution’ section of Note 2012035.
The certificate might have multiple web addresses associated – scroll down to see the rest.
Example: dps.ws.hmrc.gov.uk is added to the COMODO certificate of online.hmrc.gov.uk. You try to establish a connection to the DPS site https://dps.ws.hmrc.gov.uk:443/dpsauthentication/service. The certificate’s ‘Subject name’ shows online.hmrc.gov.uk .
Download and open the certificate; scroll down to see whether ‘dps.ws.hmrc.gov.uk ‘ is in the list.
You can also check whether the latest certificate available contains the address at section ‘Certificate Subject Alt Name’. See an example with the COMODO certificate of online.hmrc.gov.uk – the address ‘dps.ws.hmrc.gov.uk’ is in the list: