Can Atriuum be accessed through a firewall?
Yes. Atriuum can be configured with a proxy server to limit and restrict firewall traffic, so only the proxying Web server can access Atriuum. By default, Atriuum uses port 80 for HTTP and HTTPS. For use of the Quick Cataloging feature, Atriuum uses a built-in Z39.50 client which typically uses port 210 or 7090 (Library of Congress).