What does this mean?

[deckel at relay.nswc.navy.mil]

For the past two days, when I've gone into SunView, I've gotten the
following message:  No selection service available: RPC timed out.  I've
seen this message before at various times.  Does anyone know what it
means?

Debbie Eckel
Naval Surface Warfare Center
deckel at relay.nswc.navy.mil