IDB backup failed - Cannot read DBSM message

There is problem with IDB backup

DP 8.0 + BDL801 patch, CM on Windows 2008R2

[Normal] From: OB2BAR_POSTGRES_BAR@myserver.com "DPIDB" Time: 10/9/2015 7:45:57 AM Check of the Internal Database consistency succeeded

[Major] From: OB2BAR_POSTGRES_BAR@myserver.com "DPIDB" Time: 10/9/2015 7:53:07 AM Cannot read DBSM message (Interprocess communication problem. System error: [10054] Connection reset by peer )

[Critical] From: OB2BAR_POSTGRES_BAR@myserver.com "DPIDB" Time: 10/9/2015 7:53:08 AM An internal error occurred

Any ideas? omnidbcheck -extended

all lines OK

archive_mode = on in C:\ProgramData\OmniBack\server\db80\pg\postgresql.conf