Hi,
Please check the below SAP note.
1452509 - MDM PI Adapter channel not working
Solution
- Restart the MDM ADAPTER java component:
Login into the NWA (NetWeaver Administrator) on the relevant AS Java engine, go to System Management->Administration, restart the application named "tc~mdm~adapter~svc".
- A solution which includes an automatic recovery from this state is expected in MDM 7.1 SP05 as part of the MDM JAVA API.