Hi Ronni and thank you for the input.

> On 29 Nov 2018, at 10:57 am, Ronni Brown <ro...@mac.com> wrote:
> 
> Hi John,
> 
> In System Preferences > Network > Ethernet - what IP address is showing, does 
> it start with 169?

IP address on both computers start with 192.

> Check System Preferences/Network, select the Ethernet, and make sure 
> Configure IPv4 is set to Using DHCP (not DHCP using manual address). 
Ipv4 is configured as DHCP

> Then select Wi-Fi/Advanced/TCP/IP and check for the same thing.
IPv4 is DHCP and address starts with 192
> Then Restart your Mac mini and restart your Modem/Router.
Will now go through the restart process and get back to you with outcome.
> 
> Re: Transferring data across the Network between Mac mini & MacBook Pro.
> 
> Open System Preferences from the  Apple menu, and click on “Sharing” panel. 
> Check to enable “File Sharing” on all Macs you want to share files between. 
> From the OS X Finder, hit Command+Shift+K and then click “Browse” to find and 
> connect to the desired Mac
> 
> Apple has axed the iCloud feature Back to My Mac in Mojave, which made screen 
> and file sharing possible between two Macs, even when they weren’t on the 
> same network.
> 
> Cheers,
> Ronni
> 
> 13-inch MacBook Air (April 2014)
> 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz
> 8GB 1600MHz LPDDR3 SDRAM
> 512GB PCIe-based Flash Storage
> 
> macOS High Sierra 10.13.6
> 
>> On 29 Nov 2018, at 8:56 am, John Thompson <jetj...@optusnet.com.au 
>> <mailto:jetj...@optusnet.com.au>> wrote:
>> 
>> Good morning list.
>> 
>> I have two computers, a MacMini and a Macbook Pro, both upgraded succesfully 
>> to Mojave. The MacMini is the main computer and the Macbrook Pro is used 
>> primarily when travelling.  Up until the upgrade, I have had no problems 
>> with networking the two machines and transferring required data when 
>> preparing to travel.  Now, neither machine will see the other, in fact the 
>> message is ‘unable to connect’.
>> 
>> The only disparity I see when comparing the Network settings is on the 
>> MacMini.  The Ehernet Status is Connected but 'has a self-assigned IP 
>> address and will not be able to connect to the Internet.’.
>> 
>> Does anyone have any idea what the probvlem may be?  I can give further data 
>> when and if required.
>> 
>> Thank you
>> 
>> John Thompson
>> 
>> 
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