Last year I did a migration for three nodes' RAC DB from old machine into new machine.The whole replacement is wonderful with no risk and providing 7/24 HA, but I encountered a little problem about Web dbconsole that I couldn't reconfigure dbconsole successfully.

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Some errors from emagent.trc as below:
2011-02-06 10:03:07 Thread-4135253696 ERROR util.files: ERROR: nmeufis_new: failed in lfiopn on file: /local/bin/oracle/product/10.2.0/db_1/rac1_PRD11/sysman/emd/agntstmp.txt. error = 2 (No such file or directory)
2011-02-06 10:03:07 Thread-4135253696 ERROR ssl: Open wallet failed, ret = 28750
2011-02-06 10:03:07 Thread-4135253696 ERROR ssl: nmehlenv_openWallet failed
2011-02-06 10:03:07 Thread-4135253696 ERROR http: 6: Unable to initialize ssl connection with server, aborting connection attempt
2011-02-06 10:03:07 Thread-4135253696 ERROR pingManager: nmepm_pingReposURL: Cannot connect to https://xxx.com:1158/em/upload/: retStatus=-1

Some errors from emdctl.trc as below:
2011-02-06 10:00:21 Thread-4135848736 WARN http: snmehl_connect: connect failed to (xxx.com:3938): Connection refused (error = 111)
2011-02-06 10:00:42 Thread-4135729952 WARN http: snmehl_connect: connect failed to (xxx:3938): Connection refused (error = 111)

After applying Patch 8350262,the configuration of dbconsole was going well.Here is the detailed steps about how to apply it and fix this problem.
https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&doctype=BULLETIN&id=1222603.1