Tuesday, February 18, 2014:

Saturday, February 22, 2014 - 8:00 AM to 5:00 PM ET - Network Maintenance: CDX Web and the Exchange Network may experience intermittent outages due to network maintenance.

Friday, November 8, 2013:

Saturday, November 16, 2013 - 8:00 AM to 12:00 PM ET - Database Upgrades: CDX Web and the Exchange Network may experience intermittent outages due to database maintenance.

Thursday, October 31, 2013:

Saturday, November 2, 2013 - 8:00 AM to 12:00 PM ET - Database Upgrades: The CDX Pre-Production Environment may experience intermittent outages due to database maintenance.

Friday, September 13, 2013:

Sunday, September 15, 2013 - 9:00 AM to 5:00 PM ET - Software Updates at NCC: SDWIS, WQX, and other CDX backend flows will be unavailable due to Software Updates.

Friday, September 6, 2013:

Sunday, September 8, 2013 - 8:00 PM to 12:00 AM ET - Server Maintenance at NCC: SDWIS, WQX, and other CDX backend flows in both the Staging and Production environments will be impacted due to server maintenance.

Friday, September 6, 2013:

Saturday, September 21, 2013 - 6:00 AM to 12:00 PM ET - Server Upgrades: CDX and the Exchange Network will be unavailable due to server upgrades.

Friday, September 6, 2013:

Saturday, September 7, 2013 - 6:00 AM to 12:00 PM ET - Database Maintenance at NCC: SDWIS, WQX, and other CDX backend flows will be unavailable due to database maintenance.