Sunday, May 15, 2005:

May 15, 2005 - System Upgrade/Maintenance: The CDX application server for archives and Gentran process will be unavailable from 06:00 PM to 11:30 PM Sunday night. This will temporarily affect CDX Web back-end archiving processes for all CDX Web data flows. The Exchange Network won't be affected; however, EPA Node exchanges using CDX will be interrupted.

Sunday, May 1, 2005:

May 1, 2005 - System Upgrade/Maintenance: The CDX mail server will be unavailable from 08:00 PM to 11:00 PM Sunday night. This will temporarily affect CDX Web mail functionality and AQS users will be unable to download files from CDX AQS Web during this time.

Friday, March 4, 2005:

March 4, 2005 - System Upgrade/Maintenance: The UCMR Flow will be unavaliable to all CDX Web UCMR users from 05:00 PM to Saturday, March 5, 2005 05:00 PM. This will not affect other CDX Web Flows or EPA Node exchanges using CDX.

Saturday, February 26, 2005:

February 26/27, 2005 - UCMR will be unavailable from 7:00am Saturday 2/26 to 7:00pm Sunday 2/27 due to Oracle upgrade activity.

Sunday, February 13, 2005:

February 13, 2005 - System Upgrade/Maintenance: The CDX web will be unavailable to all users from 08:00 PM to 11:00 PM. This will not affect the Exchange Network; however, EPA Node exchanges using CDX will be interrupted.

Sunday, December 5, 2004:

December 05, 2004 - GigaBit Switch Upgrade: The CDX Web and the Exchange Network will be unavailable to all users from 8:00 PM to 12:00 PM (EST).