Reply to "ReetP":
Sorry for the delay (couldn't reach Koozali forums from late afternoon until this morning).
Please find attached network map; details on router type, firewall and connection are included.
Please note that my local LAN has no WiFi interface, only Ethernet.
I've checked the links on 0x80240438 error but the only realistic connection seems to me to be with the firewall/proxy.
(Microsoft Troubleshooter is, as I've always found, useless)
I have found that the 0x80240438 problem occurs when checking for updates. When an update was downloaded, (by temporarily replacing the old server) then after connecting the new server and attempting to execute an "install" I get "server not found", (even though I can browse successfully).
I also found that using the new server my anti-virus, (BitDefender), updates fail with a similar error, (server not found).
The printer is outside my internal LAN because I have to check out other Laptops etc which I don't want to connect to my LAN but I also need to use it myself to print/scan in b/w & colour.
From both old and new servers I can print successfully and can browse to the printer's web interface (192.168.1.246) but I cannot scan from the new server.
Thanks for your help.
Alex