Why can computer A ping B but not vice versa?

[djeipa]

Do you know why computer A can ping computer B but computer B can't ping computer A ? Firewalls on or off in this local cable sharing are not a problem. Just now that I can't do things like setting up [\\computerAName\ASharedFolder] from computer B's sharing widzard anymore. How can i fix this problem ? Thanks in advance

 

[mezarashi]

That's honestly a very vague description for a very complicated system where a million things can go wrong. So you can access computer A (\\compA) from computer B, but not (\\compB) from computer A?

 

[djeipa]

No, they can't look at each others shared folders, err message says "it doesn't appear to be a valid folder,pls specify another one", and B can ping A but A can't ping B.

What happens with both I don't understand/