Screen sharing only works for some computers

I have 3 computers on the same network.  For this thread I will refer to them as C1, C2 & C3.  All computers show in the sidebar as shared and I can look at all the files within these computers.
C1 and C2 can see C3 with screen sharing but no other combination works.  exp. C1 can't see C2, C3 can't see C1 or C2.
All computers are set the same and all worked a week or so ago.  Pref. Sharing has share files and share screens checked.  They all require an administrator to access.  They all have Firewall ON and Stealth and signed software are checked.
Can anyone give me some idea what might be going on here.
Thanks,
Ken

Do you mean that sometimes you can connect and sometimes you can't or that after connecting sometimes it stops working?
I haven't had any problems accessing my G5 running Leopard Server either from my MacPro or my Macbook over the internet which is much slower than a gigabit ethernet network. The G5 connects over a 24Mb cable connection and the other computers access the net using a DSL line (16Mb, but I have also done it over an 8Mb DSL line).

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