Adobe & "com.ibm.jsse2.util.h: No trusted certificate found" error

Suddenly a new error on Websphere Application Server, where Adobe PDF Generator runs:

RemoteException occurred in server thread; nested exception is:
java.rmi.RemoteException: org.omg.CORBA.COMM_FAILURE: CAUGHT_EXCEPTION_WHILE_CONFIGURING_SSL_CLIENT_SOCKET:
JSSL0080E: javax.net.ssl.SSLHandshakeException - The client and server could not negotiate the desired level of security.
Reason: com.ibm.jsse2.util.h: No trusted certificate found vmcid: 0x49421000 minor code: 70 completed: No

Found this 6 point help somewhere on the web (thanks Soorya!):

Hi,
You need to obtain signer certificates from remote machine for SSL configuration.
I have explained you the steps below for the same.
1. From administrative console, follow
Security -> SSL certificate and key management -> key stores and certificates - > NodeDefaultTrustStore -> Signer certificates -> Retrive from port.
2. Enter remote machine name at Host.
3. Enter CSIV2_SSL_MUTUALAUTH_LISTENER_ADDRESS of the remote machine at Port.
4. Enter Alias for reference.
5. Click “Retrieve signer information”.
6. Apply and save the changes.

Hope it will useful.
Regards,
Soorya Prakash.S

Following the hints, I managed to solve using localhost:9043 for points 2 and 3, and "adobe" for point 4. No reboot needed, the application now transforms into PDF nicely.