When using this link from within 3D Part & Assembly Design :
I get this error:
I am able to access the thread successfully when not in the 3D modeling forum.
Khoros is working on some redirects based on the Tips boards migration. That work led to those errors yesterday across the community, but it should be resolved now and I'm not able to reproduce it. Are you still seeing that error?
I just tested it and it now redirects to the Creo Tips page.