Can't access Mac pro via File Share (icon appears in shared sidebar)

Hi all
Lately I've been having File Sharing problem. I have an iMac, Mac Pro (2010) and a Macbook (white), now the moment that the iMac and Macbook are open I see my Mac Pro in the "Shared" sidebar, so everything looks good "they" see it BUT the moment that I try either one to connect to it, it say's "Connection failure". Now when I try to connect to my iMac and Macbook from my Mac Pro no problem at all and connects without having any problems and see both iMac and MacBook in the sidebar like the others. So why can't "they" connect to my Mac Pro (they used to not so long ago) even though they appear in the sidebar?? I have turned off/on File sharing in my Mac Pro but nothing, rebooted Mac Pro nothing, turned off/on WiFi nothing, checked Firewall and it's green so what's keeping my iMac and MacBook not to connect??? I tried just connecting to the internet with just WiFi and unplugged ethernet to make sure that my WiFi gets and receives signals and it does so the card looks to be working as it should.
Thanks for any help with this!!!
Serge

Hi Capt,
In order to help you analyze your issue, we need confirm some situations.
1. Did these 3 computers all join the same HomeGroup or Workgroup?
Yes
2. Domain Controller server with two joined workstations you mentioned, did it mean two of these 3 computer joined the domain environment?
No. Those are separate computers in their own domain, just using the same network.
3. Did you ping via IP address or computer name?
Both, but this morning something is different.
a. MommaDell and M6600 can ping each other both by IP and Name, but can't ping Tower-755 either way.
b. Tower CAN ping both MommaDell and M6600 both ways.
According to your description,
Tower cannot ping MommaDell and M6600.
No, Tower CAN ping both MommaDell AND M6600 both by ip and name.
MommaDell can ping Tower.
M6600 can ping Tower.
Both of the above was true yesterday, but not this morning.
Please check if MommaDell and M6600 could ping each other.
Yes they can
And make sure all of them turn on the network discovery and turn off the firewall temporarily for test:
Network Discovery is ON in all three machines, and Windows firewall is always off because I have ZoneAlarm on all three machines.
Enable or disable network discovery
Which?
http://windows.microsoft.com/en-in/windows/enable-disable-network-discovery#1TC=windows-7
If it doesn't resolve, please post every computer's ipconfig /all output here for analysis.
it's 7:30 and I have to be out until 2:30. I'll do the posting then, and thanks for the help.
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]
Capt. Dinosaur

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