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build 9860 Win 7 and XP machine access (solved)
Hi there
Old network problem has re-appeared again in build 9860 W7 and XP machines cannot access W10 machine. W10 machine CAN access W7 and XP.
The XP and W7 machines CAN access W10 when accessed by IP address but it doesn't work by HOSTNAME (or computer name). I am using DHCP so no fixed Hosts files with IP address and Hostname fixed in a config file.
Note problem is connections FROM XP / W7 TO W10 not the other way around. (W8.1 machines work fine)
Now with a bit of Googling and testing you can make it all work.
If you BLOCK port 139 in the windows 10 firewall it all works fine again -- seems the older computer systems use both ports 445 and 139 while Windows 10 only wants to listen to port 445 - so if you block port 139 the older OS'es switch to port 445 which works properly.
If you switch OFF the firewall you'll get a problem again because the older OS'es will send out via Port 139 which W10 isn't listening for - but won't get a notification that the request is not accepted so they won't fall back to port 445.
First time I've found that testing is EASIER with the Firewall ON !!!!!!.
You do NOT need to lower the encryption security from the default 128 bit (even for XP machines) in the file sharing setup in Network connections (control panel). Just block port 139 (on the W10 machine).
Cheers
jimbo
Last edited by jimbo45; 24 Oct 2014 at 05:31.
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