XP, 7, 8.1 LAN not seeing the other's server with ports open

[Rob0]

updated my network from 3 xp machines to 1-xp, 1-7 home, and 1-8.1 with 8.1 and 7 as my primaries. I used to run a server on one and use two clients to test new scripts were working well for others. but now on 8.1 and 7 I cannot get either to see the other's LAN server through MTA Local. Both 7 and 8.1 are running servers, both report all ports are open, but neither one can see the other in Quick Connect Local... despite the lone XP survivor seeing both servers in Local as always. Any Ideas beyond downgrading to the only OS ever made that just works.

[jhxp]

Make sure that the Windows Firewall in 7 / 8.1 is not blocking the MTA Server.exe.

Also, try adding it manually to the firewall exceptions (both to the 'public' and 'private' group):

http://www.sevenforums.com/tutorials/54 ... ption.html