Is there a way, on the flasharray (either GUI or CLI) to check connections hitting a specific port on one of the controllers?
I've got a support case open on this as well, but it appears that we have no hosts hitting one particular port on our array despite all configs looking correct
Did you check fabric logins on the mds site? Did you double check you zoning, vsans, is this new setup, new server, were there any changes done on pure, mds etc...?