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Hanging Connection While Accessing On-Premise CIFS from Oracle Cloud Instance (OCI) Linux Instance

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edited Apr 13, 2022 6:37AM in Cloud Infrastructure - Linux

A user is experiencing connections hanging when connecting from OCI to an on-premise file share via a CIFS mount. Trying to access files on the CIFS mount may fail with a 'Resource temporarily unavailable' error message, such as in the following example:

# cat /proc/mounts | grep cifs

//<on-premise-cifs-server>/share /mnt/winfiles cifs ...

# cd /mnt/winfiles

# ls -tlr

ls: reading directory .: Resource temporarily unavailable

total 0

The server sharing the CIFS share is online. The user's network is fragmenting packets being sent between the Linux Instance and the CIFS server, as verified by the output of the following ping test:

# ping <on-premise-cifs-server ip> -M do -s 8000

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