Collection status : Disabled by Upload Manager

When retrieving the status of the Grid Control agent I noticed that the collection status has a value of "Disabled by Upload Manager". This error is caused by a file that can't be uploaded.

$ ./emctl status agent
Oracle Enterprise Manager 10g Release 3 Grid Control 10.2.0.3.0.
Copyright (c) 1996, 2007 Oracle Corporation.  All rights reserved.
---------------------------------------------------------------
Agent Version     : 10.2.0.3.0
OMS Version       : 10.2.0.3.0
Protocol Version  : 10.2.0.2.0
Agent Home        : /app/oracle/product/agent10g
Agent binaries    : /app/oracle/product/agent10g
Agent Process ID  : 1634352
Parent Process ID : 807000
Agent URL         : https://hostname:3872/emd/main/
Repository URL    : https://hostname:1159/em/upload
Started at        : 2009-04-20 14:42:37
Started by user   : oracle
Last Reload       : 2009-04-20 14:42:37
Last successful upload                       : (none)
Last attempted upload                        : (none)
Total Megabytes of XML files uploaded so far :     0.00
Number of XML files pending upload           :      882
Size of XML files pending upload(MB)         :    50.40
Available disk space on upload filesystem    :    14.71%
Collection Status                            : Disabled by Upload Manager
Last successful heartbeat to OMS             : 2009-04-20 14:42:56
---------------------------------------------------------------
Agent is Running and Ready

[AGENT /app/oracle/product/agent10g/bin ]
$ ./emctl upload
Oracle Enterprise Manager 10g Release 3 Grid Control 10.2.0.3.0.
Copyright (c) 1996, 2007 Oracle Corporation.  All rights reserved.
---------------------------------------------------------------
EMD upload error: Failed to upload file A0000017.xml, ret = -2

If you remove the file from $AGENT_HOME/sysman/emd/upload the upload will succeed and the status will be normal again.