Some pointers:
After upgrade of SnapCenter to 4.1.1P3 the storage connection cannot be retrieved:
https://kb.netapp.com/Advice_and_Troubleshooting/Data_Protection_and_Security/SnapCenter/After_upgrade_of_SnapCenter_to_4.1.1P3_the_storage_connection_cannot_be_retrieved
Note: Please check if storage system <SVM> is resolvable or add an entry to etc/hosts file on snapcenter.
Another pointer to ensure steps are taken: [Ensure SVM mgmt_lif is added as storage connection i.e role=data, data-protocol=none]
http://docs.netapp.com/ocsc-40/index.jsp?topic=%2Fcom.netapp.doc.ocsc-ag%2FGUID-5B2FB84B-91E9-4307-92DF-9B5B1E98A000.html