Frame creation fails on Solaris 2.5.1 when using explicit host machine

On Solaris 2.5.1/SPARC. BUILG 1.2FCS-G

Compile the following program, then run it on 1.2fcs-G as "java Test" with
different combinations of the DISPLAY variable. In some combinations, it
hangs.

On 2.5.1 calterra, running on display 0.0,

setting DISPLAY to:

:0.0 - works
:0.1 - works
calterra:0.0 - hangs most of the time (for example, I just got
FAIL
WORKED
INCOMPLETE Widget creation (may be unrelated)
WORKED
FAILED
FAILED
localhost:0.0 - hangs sometimes
unix:0.0 - worked for Mr. Larry Cable, hanged for me.

I've tried this on a 2 monitor 2.5.1, and on a 1 monitor 2.5.1, also using
OWM and TWM. WIth the X client/server on one machine and on two different
machines. It behaved (approximatedly) like this in all cases.

Janet K. and I have seen it hang once on a 2.6 but then it worked OK. In that
occasion we first had DISPLAY wildhorses:0.0 (HANG), DISPLAY :0.0 (WORKED),
when we tried wildhorses:0.0 it worked.

May or not be related to 4168586