[Koha] z39.50 search not working

[Shelley & Kurt Kemperman]

A couple weeks ago, I was in the middle of cataloging a stack of books.  The z39.50 search function worked for one book and then on the next book, it stopped working and I haven't yet figured it out.  I usually use the Library of Congress, Biblios, and Access PA z39.50 sites.  The messages I'm getting are:  "connection failed to 1x2.loc.gov"  and "nothing found".  There have been no new security things or firewalls installed (this is a school computer).  And it literally happened from one book to the next.  Any ideas?

Thanks,
Shelley