Following up and confirming that Powerline is working fine on the library server. Thanks again!
I didn't have enough time last evening to get a successful login from a patron computer with the prebook winclient installed. The prebook login launches but login fails with the error message "cannot execute xml-rpc method:pcres authenticate server etc" I suspect this is a firewall issue but I didn't have time to look into it - all traffic from the clients passes through an IPCOP/Dansguardian proxy filter/firewall.
(A heads up to anyone installing the prebook client: We're running ident on the patron computers to allow filtered or unfiltered insternet access based on user login and prebook client won't install fully on a computer running an ident daemon, it appears to install, the autologin sorta works but it doesn't launch the preclient login screen.)
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Jesse McDonnell