The commons.lbl.gov server was down for ~1 Hour on Friday, April 5th starting at 6PM while the Confluence software was being upgraded to a newer version which contains a bugfix for the following security vulnerability:
https://confluence.atlassian.com/doc/confluence-security-advisory-2019-03-20-966660264.html
The WebDAV Plugin and Widget Connector and Office Connector Add-ons have been re-enabled.