We hit a problem recently where by we could not connect to a Dell Networking switch over the Mgmt 1/1/1 port using SSH, ping worked and SSH worked in-band.
Turns out that the SonicWall in front of the Out of band network was dropping packets as it didn't like the the sequence numbering from OS10. This was disabled from the SonicWall /diag.html interface and now works!
I have raised this was Dell support, as customers should not have to disable firewall functionality to make SSH work.
