I have a new issue... I am updating all Edgesight XenApp agents to 5.2 and I have problem on only some servers. These servers have remapped drivers ( m: & n: ) and run Windows 2003 R2 Sp2. The installation is successful without any error but after a reboot the service doesn't want to start with the message : "The Citrix System Monitoring Agent service on Local Computer started and the stopped..." In Event Logs Type: Error Event Source: Citrix System Monitoring Agent Event Category: None Event ID: 34 Date: 16/10/2009 Time: 09:49:32 User: AUTORITE NT\SYSTEM Computer: EMCXPA000 Description: The Citrix System Monitoring Agent was unable to startup. Please consult the Sys_event_txt.txt agent log in your data directory for details. Click on read more to continue Then : Event Type: Error Event Source: Citrix System Monitoring Agent Event Category: None Event ID: 22 Date: 16/10/2009 Time: 09:49:37 User: AUTORITE NT\SYSTEM Computer: EMCXPA000 Description: The Citrix System Monitoring Agent has attempted to recover from a database error but was unable to do so. The when I go to check the Sys_event_txt.txt log file : 2009-10-16 09:49:32 Core                     Service                  ----- Starting Agent on EMCXPA000 version 5.2.2183.0 ----- 2009-10-16 09:49:32 Core                     Service                  Current service state is 'START_PENDING' 2009-10-16 09:49:32 Core                     Collector                Starting... 2009-10-16 09:49:32 Core                     Collector                Database connection is local. 2009-10-16 09:49:32 Core                     RSI                      RsiProduct (Core): successfully opened rsi file: M:\Program Files\Citrix\System Monitoring\Agent\Core\Core.rsi 2009-10-16 09:49:32 Core                     RSI                      RsiProductDatabase (Core): State=UNKNOWN Unable to open database. Error querying database service: 20 | I/O error for file "aliases.conf" | Error while trying to open file | The data is invalid. 2009-10-16 09:49:32 Core                     Collector                Failed (4313) to initialize product: M:\Program Files\Citrix\System Monitoring\Agent\Core\Core.rsi 2009-10-16 09:49:32 Core                     Collector                Error initializing MPACollector. hr: 0x80004005 2009-10-16 09:49:32 Core                     Collector                ----- Core Collector Failed to Start ----- 2009-10-16 09:49:32 Core                     CSM Update               ~~~~~ Started Citrix System Monitoring Update and Maintenance '/s /t /v /md' ~~~~~ 2009-10-16 09:49:32 Core                     Service                  Unable to initialize collector 2009-10-16 09:49:32 Core                     CSM Update               Shutting down the Citrix System Monitoring Agent 2009-10-16 09:49:32 Core                     Service                  Shutting down collector... 2009-10-16 09:49:32 Core                     CSM Update               Failed to shutdown service rscorsvc.  Error=1052 2009-10-16 09:49:32 Core                     Service                  Current service state is 'STOPPED' 2009-10-16 09:49:32 Core                     CSM Update               Service state for rscorsvc is 'START_PENDING' 22009-10-16 09:50:08 Core                     CSM Update               Error querying database service: 21 | I/O error for file "RSDatr.fdb" | Error while trying to write to file | The operation completed…