When you try to synchronize with the central model (Sync with Central), a message informs you that the "The requested operation cannot be completed because the model is not currently available," or the system crashes.
To verify that the issue is caused by the SMB version
If the error does not reoccur, it was caused by the SMB compatibility issue.
If the error does reoccur, it may be caused by another issue:
Next, ensure that everyone has the latest updates applied to Revit.
If no one else is interacting with the Central model through Revit, check that there are no applications that would interact with the central model files on the file server. These could include anti-virus, backup software, shadow copy service, and so on.
To resolve the SMB compatibility issue, try one or more of the following solutions:
For every system that accesses the file server, change Worksharing Update Frequency to Manual. See Control the Frequency of Worksharing Display Updates.
By default, this setting is defined as 5 seconds. By changing it to Manual, you reduce network communication between the file server and the workstation.
If users use the Worksharing Display Mode feature, the workset display updates only when users manually refresh it (such as when synchronizing). If changing Worksharing Update Frequency to Manual avoids the error, you can try increasing the update frequency to determine the point at which the issue reoccurs.
Revit Server does not use SMB for network communication; instead, it uses TCP.