iPrint appliance 1.1, patches 417 & 418 applied, running in VMWare

Suddently this afternoon I am no longer able to authenticate to the
PSMStatus page to check on printers. Also, in iManager if I try to
access the Print Manager it throws an authentication error as follows:

Authorization Required
IPP Error: 0xF0191
HTTP Error: 401

Tomcat6, Jetty, and Apache are all running on the machine and I have
restarted Jetty but no difference. Is this a certificate issue
similar to TID 7016019? I can't see any way in the appliance iManager
to refresh certificates. The certs I imported into the appliance,
long ago on the initial deployment, are not showing as expired.

Any ideas?