Event ID - 4156

Event Id4156
SourceMSDTC
DescriptionString message: TM failed to connect to the RM. Following was the connect string.
Event InformationWhen you use transactional Microsoft Transaction Server (MTS)/COM+ components against Oracle databases, the components fail with this (followed by Event ID 53286) errors in the event log.
CAUSE: This problem occurs if RMGUID is not being initialized as part of the Oracle client software installation.
RESOLUTION: To resolve this problem, reinstall the Oracle client software.

Follwing MS articles will help you to understand other causes and its resolutions.
Reference LinksPRB: Error "GetXaSwitch Function Failed" When You Use Transactional MTS/COM+ Components with Oracle Databases

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