Server Admin & Monitor 10.5.7 “no server available at the address you entered”

Hi, Since the 10.5.7 update neither server monitor or admin can find the server - "There is no server available at the address you entered." This happens on both remote clients and locally on the server. Both apps show no servers available at all. Workgroup manager still connects. DNS services are still being provided and apparently correctly. I can connect through terminal SSH and all server functionality seems to be good. It is an old g4 xserve 1gHz. Anyone got any ideas? Thanks