Screen sharing and file sharing not working on LAN

This is not a Mavericks specific problem since it existed before I upgraded to Mavericks. I have a LAN that consists of 3 MBPs and 1 MacPro.
Local screen sharing and file sharing works fine on all of these computers except for one MBP. From this MBP I am able to connect to all of the other computers for screen sharing and file sharing. But I can't connect to this particular MBP for screen sharing or file sharing from any of the other Macs.
This MBP shows up in the left hand side column under "Shared" on all the other computers. But I am unable to make a connection from any computer to the problematic MBP. I get the message, "There was a problem connecting to the server "xxxxxxxx". The server may not exist or is unavailable at this time".
I have tried toggling off and on screen sharing and file sharing with no effect. One probably pertinent strange thing that I notice is that under the Screen Sharing set up the green button next to "Screen Sharing:On" is green. But the message under it states:
"Other users can access your computer's screen
at vnc://johnmacbookproretina/ or by looking for “John MacBook Pro” in the Finder sidebar."
The problem is that my computer name is "John MacBook Pro" and the LocalHostName is "JohnMBPr.local". I believe that at some point in the past the computer name and/or LocalHostName was "johnmacbookproretina".
Similiarly, under File Sharing I am informed:
"Other users can access shared folders on this computer, and administrators all volumes, at “afp://johnmacbookproretina” or “smb://johnmacbookproretina”."
I would appreciate any help I could get to resolve this perplexing issue. Thanks.
John

I've finally been able to solve my own problem.
File sharing and screen sharing on the problematic MBP was being blocked by firewall rules that had been set up several weeks ago when I had installed a trial version of DoorStop X firewall software. I had previously trashed the app when the 30 day trial ended. I did not realize that the software had left a set of firewall rules in the Library/StartupItems folder. Among other things, the rules were set to deny access to the computer on the ports used for file sharing and screen sharing. Once I trashed the DoorStopStartup folder in the StartUpItems folder all the connection problems resolved with a computer restart.

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22/07/14 20:09:41,966 mDNSResponder[57]: ERROR: handle_resolve_request bad interfaceIndex 6
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