Sunday, September 5, 2010:

Monday, August 23, 2010 - 8:00 AM to Sunday, September 5, 2010 - 11:00 PM ET - Database Upgrades: To improve the quality of performance and better serve our data exchange customers, EPA is performing upgrades to the CDX environment. During this maintenance period, users of the CDX Web and Exchange Network may not be able to access some older records prior to March 2009. All records will be restored and accessible at the conclusion of this maintenance window. We apologize for any inconvenience. If you have any questions, please contact nodehelpdesk@epacdx.net.

Saturday, August 28, 2010:

Saturday, August 28, 2010 - 8:00 AM to Sunday, August 29, 2010 - 12:00 PM ET - Database Upgrades: The CDX Web and Exchange Network may experience intermittent outages due to database maintenance.

Friday, July 30, 2010:

Friday, July 30, 2010 - 8:00 PM - CDX will be upgrading some user public/private key pairs used in CROMERR components to comply with federal information processing standards and directives. If you have difficulty decrypting files please contact the CDX Help Desk at (888) 890-1995 for assistance.

Sunday, July 18, 2010:

Sunday, July 18, 2010 - 8:00 PM to Monday, July 19, 2010 - 12:00 AM EST - The CDX Production environment and the Exchange Network may experience intermittent outages.

Sunday, July 11, 2010:

Sunday, July 11, 2010 - 8:00 PM to Monday, July 12, 2010 - 12:00 AM EST - The CDX Production environment and the Exchange Network may experience intermittent outages.

Saturday, July 10, 2010:

Saturday, July 10, 2010 - CDX will deploy mandatory TLS browser encryption. Users without compliant and properly configured web browsers will be unable to reach CDX.

Sunday, June 27, 2010:

Sunday, June 27, 2010 - 8:00 PM to Monday, June 28, 2010 - 12:00 AM EST - The CDX Production environment and the Exchange Network may experience intermittent outages.

Sunday, May 2, 2010:

Sunday, May 2, 2010 - 08:00 AM to 12:00 PM EST - The CDX Web and Exchange Network may experience intermittent delays in electronic mail delivery due to system maintenance.

Saturday, April 24, 2010:

Saturday, April 24, 2010 - 06:00 AM to 11:00 PM EST - CDX and the Exchange Network may experience intermittent outages due to hardware upgrades.

Saturday, April 17, 2010:

Saturday, April 17, 2010 - 06:00 AM to 11:00 PM EST - CDX and the Exchange Network may experience intermittent outages due to hardware upgrades.

Saturday, April 10, 2010:

Saturday, April 10, 2010 - 09:00 AM to 10:00 AM EST - CDX and the Exchange Network may experience intermittent outages due to hardware upgrades at the EPA National Computer Center (NCC) in Research Triangle Park.