Using multi server for SAP systems bring with many problems that is hard to find.ICM_HTTP_CONNECTION_FAILED was one of these errors whose reason is directly dependent with server name.OPEN DATASET error causes from a similar behaviour which arises according to the server where the ABAP program is executed. OPEN DATASET tries to open a server file from AL11. However if your SAP system is on a multi server environment the path of the file in AL11 may not be visible in each SAP server which causes open dataset to return with subrc equal 8.
In this case basis team should mount this folder path so that every server should see this folder path. You can check it by clicking related folder and reaching the file thorugh AL11.