ARB11 + Windows Server 2008 FTP upload fails

One more thing:
The backup creates a few small files when the backup starts. So there's really nothing wrong with the access.
Can it be that the space on C:/ is to small and a temporary file needs to be created?

First error:
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Log Entry Details
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Type: Error
Date and time: 2012-07-18 16:14:51
Backup plan: Shadow Copy Harddrive
Task: Simple backup (Full)
Code: 20 250 685(0x135003D)
Module: 309
Owner:
Message:
Command 'Backing up' has failed.
Additional info:
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Error code: 61
Module: 309
LineInfo: 4a8728dc8a1c94f4
Fields: $module : service_process_vs
Message: Command 'Backing up' has failed.
--------------------
Error code: 3
Module: 329
LineInfo: 1cd98aae889424f9
Fields: $module : disk_bundle_vs
Message: Backup has failed.
--------------------
Error code: 1060
Module: 1
LineInfo: 145a191bfe9050bf
Fields: $module : disk_bundle_vs
Message: No operation for executing.
--------------------
Acronis Knowledge Base: http://kb.acronis.com/errorcode/

Event code: 0x0135003D+0x01490003+0x00010424

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Second error presented the on the same second:

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Log Entry Details
--------------------
Type: Error
Date and time: 2012-07-18 16:14:51
Backup plan: Shadow Copy Harddrive
Task: Simple backup (Full)
Code: 4 194 350(0x40002E)
Module: 64
Owner:
Message:
Failed to open the backup location.
Additional info:
--------------------
Error code: 46
Module: 64
LineInfo: 97675718d2b52d19
Fields: path : *************, $module : disk_bundle_vs
Message: Failed to open the backup location.
--------------------
Error code: 17
Module: 4
LineInfo: 5dc3786a32fb18a6
Fields: $module : disk_bundle_vs
Message: The specified file does not exist.
--------------------
Acronis Knowledge Base: http://kb.acronis.com/errorcode/

Event code: 0x0040002E+0x00040011

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Well, I removed the job and made a new one with the same settings...everything works.

Got a very similar problem, but for me it keeps failing.
Support is also not helpful up to now.

Befehl 'Backup-Plan 'Enterprise Disk C: laufend (voll, differentiell)' wird ausgeführt' ist fehlgeschlagen.
Zusätzliche Info:
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Fehlercode: 61
Module: 309
LineInfo: 4a8728dc8a1c950f
Felder: $module : mms_vs_32308
Nachricht: Befehl 'Backup-Plan 'Servername Disk C: laufend (voll, differentiell)' wird ausgeführt' ist fehlgeschlagen.
--------------------
Fehlercode: 41
Module: 307
LineInfo: e6792a5ee190dda7
Felder: $module : agent_protection_addon_vs_32308
Nachricht: ProtectCommand: Ausführen des Befehls fehlgeschlagen.
--------------------
Fehlercode: 46
Module: 64
LineInfo: 91e4c52610c9194
Felder: path : ftp://ftpservername/, $module : disk_bundle_vs_32308
Nachricht: Öffnen des Backup-Speicherorts fehlgeschlagen.
--------------------
Fehlercode: 20
Module: 4
LineInfo: 31813f5926d10e2e
Felder: $module : disk_bundle_vs_32308
Nachricht: Zugriff auf die Datei verweigert.
--------------------

We have the same problem with excact the same error messages.

Our backup ftp space did not changed nor the config of the backup tasks did. Nevertheless since 2 weeks the ftp backups failed.
Hence we completely deleted the backup, the personal vault and the backup tasks itself and reconfigured everything.

Same error.

Newest build 11.0.17440 (updated, no clean install).
After update everything works normal for about 6 weeks.
Without changes - error above.
We can connect to FTP with other software without problems. (Its and internal FTP path at our server system with 3 max. connections)

If we want to connect with Console Manager to the FTP space, a dialog appears that access was denied.
Then we must type EXCACT the same username and password serveral times and the connection finally works!
The dialog appears allways fast, thus theres no really timeout problem we guess.

Our FTP backup space is now useless but we pay for it - please give response for workaround or resolve the problems.