Collection status : Disabled by Upload Manager

When querying the status of the agent i noticed the collection status  showing Disabled by upload manager

oracle@sausalito:/u01/app/oracle/product/11.2.0/agent/agent11g > emctl status agent
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation.  All rights reserved.
—————————————————————
Agent Version     : 11.1.0.1.0
OMS Version       : 11.1.0.1.0
Protocol Version  : 11.1.0.0.0
Agent Home        : /u01/app/oracle/product/11.2.0/agent/agent11g/sausalito.cpp-group.com
Agent binaries    : /u01/app/oracle/product/11.2.0/agent/agent11g
Agent Process ID  : 24039
Parent Process ID : 24033
Agent URL         : https://sausalito.cpp-group.com:3872/emd/main
Repository URL    : https://uk-yo-dbmon01.cpp-group.com:4900/em/upload
Started at        : 2011-11-23 11:16:23
Started by user   : oracle
Last Reload       : 2011-11-23 11:16:23
Last successful upload                       : (none)
Last attempted upload                        : (none)
Total Megabytes of XML files uploaded so far :     0.00
Number of XML files pending upload           :      210
Size of XML files pending upload(MB)         :    50.52
Available disk space on upload filesystem    :    60.23%
Collection Status                            : Disabled by Upload Manager
Last successful heartbeat to OMS             : 2011-11-23 11:37:37
—————————————————————
Agent is Running and Ready

When I tried to upload manually i received the following message

oracle@sausalito:/u01/app/oracle/product/11.2.0/agent/agent11g/sysman/emd > emctl upload agent
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation.  All rights reserved.
—————————————————————
EMD upload error: Failed to upload file A0000005.xml: HTTP error.
Response received: ERROR-400|Data will be rejected for upload from agent ‘https://sausalito.cpp-group.com:3872/emd/main’, max size limit for direct load exceeded [8324170/5242880]

To fix the problem i  removed the file from $AGENT_HOME//u01/app/oracle/product/11.2.0/agent/agent11g/sausalito.iii-group.com/sysman/emd/upload

I then restarted the agent

oracle@sausalito:/u01/app/oracle/product/11.2.0/agent/agent11g/sausalito.cpp-group.com/sysman/emd/upload > emctl status agent
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation.  All rights reserved.
—————————————————————
Agent Version     : 11.1.0.1.0
OMS Version       : 11.1.0.1.0
Protocol Version  : 11.1.0.0.0
Agent Home        : /u01/app/oracle/product/11.2.0/agent/agent11g/sausalito.cpp-group.com
Agent binaries    : /u01/app/oracle/product/11.2.0/agent/agent11g
Agent Process ID  : 27951
Parent Process ID : 27945
Agent URL         : https://sausalito.cpp-group.com:3872/emd/main
Repository URL    : https://uk-yo-dbmon01.cpp-group.com:4900/em/upload
Started at        : 2011-11-23 11:58:22
Started by user   : oracle
Last Reload       : 2011-11-23 11:58:22
Last successful upload                       : 2011-11-23 11:59:02
Total Megabytes of XML files uploaded so far :     0.48
Number of XML files pending upload           :        3
Size of XML files pending upload(MB)         :     1.18
Available disk space on upload filesystem    :    60.27%
Last successful heartbeat to OMS             : 2011-11-23 11:58:36
—————————————————————
Agent is Running and Ready

Also refer to the following document from metalink , should should resolve the problem from happening again

Agent Upload to OMS Fails with “ERROR-400|Data will be rejected for upload from agent … max size limit for direct load exceeded” [ID 359097.1]