After migrating all Dollar Universe nodes to the new Univiewer Management Server, it is not possible to connect to $U node.
Example of error messages in universe.log:
Unable to connect to UVMS: error 300 (-1)
Unable to connect to UVMS :0 (xx/yy)
u_gethostbyname_mf(+/) returns error: Unknown host (gethostbyname(+/) returns null pointer)
Release : 6.x and 7.x
Component : UVMS, DUAS
Wrong declaration of the node in UVMS.