logon screen restarting

[J S]

I'm sure the answer to this must be obvious, but I can't see it!  I run:

$ X -screen 0 900 700 -query smpd9.uk.ba.com -from 151.2.154.65 -fp 
tcp/smpd9.uk.ba.com:7100&
[1] 944

to start up the Solaris logon screen. Then run:

$ xhost + &
[2] 1496

to allow server connections. However after entering my password the logon 
screen seems to be restarted and I'm prompted for my username again. I also 
get:

$ Xlib: connection to "151.2.154.65:0.0" refused by server
Xlib: No protocol specified

Do I need to configure something on the Solaris box to give authority?

Thanks,

JS.
xhost:  unable to open display "151.2.154.65:0"


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