Unavailable network shares

I have four mapped drives to our i.

From my pc at a command line, net use shows one as unavailable.

The three that work are set up as \\172.16.20.10\<directory name>

The one that does not work is set up as \\qs1015362a\<directory>

What brought this to a head, so to speak, was a call from my
supervisor. We are in the middle of a mess with a consultant. They
want everything, and they want it now. For their part, they drag
their feet on meeting their obligation to us. They were supposed to
have a server set yp inside our network for files to be dropped onto
using FTP. Still not there. My supervisor has been copying files
using a mapped drive to another of their servers. This morning, his
connections to the i (running v5r4, way behind on cume).

I looked at my connections and they were down, but all came back
except the one. I started iNav, and was just looking around when my
supervisor called that his connections were back.

Where do I look for where qs1015362a is defined? Looks like whatever
process uses that name is not working.

John McKee