Grid Control 11.1.0.1.0. Troubles after changing TZ.

Hi!
I've changed TZ region on servers with Grid Control 11.1.0.1.0 agents and OMS.
After that, I changed value in $AGENT_HOME/sysman/config/emd.properties for agentTZRegion to new TZ and ran
"Exec mgmt_target.set_agent_tzrgn('bla-bla:3872', 'New TZ');" for each agent.
I restarted servers, agents and OMS but I've got some troubles:
1. for servers that TZ was changed on DB-targets home pages "Page Refreshed" displays old TZ.
2. status for some DBs is Down with error of Agent Connection to Instance "Failed to connect to database instance: ORA-12528: TNS:listener: all appropriate instances are blocking new connections (DBD ERROR: OCIServerAttach).", but test connection on configuring page works.

Some DBs work fine and some have a trouble on the same server
-bash-3.00$ /u01/app/oracle/product/agent11g/bin/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/agent11g
Agent binaries : /u01/app/oracle/product/agent11g
Agent Process ID : 4462
Parent Process ID : 4454
Agent URL : https://+'agent'+:3872/emd/main/
Repository URL : https://+'server'+:1159/em/upload
Started at : 2011-03-09 12:24:22
Started by user : oracle10
Last Reload : 2011-03-10 09:40:06
Last successful upload : 2011-03-10 15:06:21
Total Megabytes of XML files uploaded so far : 67.54
Number of XML files pending upload : 0
Size of XML files pending upload(MB) : 0.00
Available disk space on upload filesystem : 36.55%
Last successful heartbeat to OMS : 2011-03-10 15:11:25
Agent is Running and Ready
Here is Home page of DB target:
Database Instance
Status
Open
Host
+'agent'+
Port
1522
SID
retail
Oracle Home
/u01/app/oracle/product/10.2.0
Details
The instance is open.
Listener
Status
Unavailable
Agent Connection to Instance
Status
Failed
Details          Failed to connect to database instance: ORA-12528: TNS:listener: all appropriate instances are blocking new connections (DBD ERROR: OCIServerAttach).

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Grid Control 11.1.0.1.0. Troubles after changing TZ.

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