Three years ago I ran into a problem with a Synology DSM update preventing vintage SMB clients from connecting to my NAS. Now I ran into a similar but different problem.
The symptom was DOS and (at least old) OS/2 clients refusing to connect to my NAS, like this:
C:\>net view \\mynas
Error 58: The network has responded incorrectly
C:\>dir n:\
Incorrect response from network
Abort, Retry, Fail?
I had updated DSM not long ago, but I suspected that that hadn’t been the trigger. More likely this happened because I got tired of fresh Windows 10 installs complaining that they don’t want to talk to SMB1, and changed the DSM settings to support everything from SMB1 to SMB3. But DOS uses SMB1, right? Well…
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