Hi Ronnie, yes sorry I didn't mention that, I had many times done a
full reboot of both the Macbook and the wireless router. 
Short story is I have resolved the issue just in the last few minutes.
I looked at the error code in the Safari window when the failure was
occurring. When I did a google search (on my iPad) it indicated that
the likely cause was a firewall protection device was the cause. The
error code was "NSPOSIXErrorDomain" which doesn't really tell the
reader too much until a search. I browsed to the various library
sub-folders looking for firewall device files - and I recalled many
years ago I had netnanny and I found one of those files sitting there.
So I trashed it. Upon restarting the Macbook, immediately the Dropbox
icon lit up - and in turn the safari browser now works. Clearly not
uninstalling correctly previously caused this but very annoying that
it took 3 hours of my time to find and unpick this. So I am back in
business. 
I hope the main reason has been corrected to with the slow Wifi
connection time being resolved. We will see if the lovely Mrs C is
happy going forth.
All the best to you all.
Kind Regards

Peter Crisp

----- Original Message -----
From: [email protected]
To:
Cc:
Sent:Fri, 17 Apr 2020 22:36:09 +0800
Subject:Re: Macbook Wifi connection ok but no Internet connection

 Hi Peter,
 You haven’t mentioned if you have:
 1. Restart the MacBook and your wireless router even if other devices
can connect to the Internet.

 Kind regards,
 Ronni
 Sent from Ronni's iPhone 7 Plus

 > On 17 Apr 2020, at 10:20 pm, Peter Crisp  wrote:
 > 
 > Hi folks, I have been trying to resolve for some hours on my
wife’s Macbook. It is a 2011 unit 10.14.6 Mojave OSX and she was
having very slow Wifi connection from sleep issues. So i deleted the
Wifi connection and re-established it.
 > 
 > The issue I am now having done this is the inability to get
Internet connection. I have truly watched and read many many threads
on this issue and carried out the ‘repair’ ideas but none has
worked. I can send a text over iMessage (within the house) and the
text is received - so Wifi is working, but there is no connection
outside of the house. All other devices in the house are fine. 
 > 
 > With the Dropbox icon in the menu bar, I can see in an instant if a
Internet connection gets connected - it remains greyed out at the
moment - though normally is dark font indicating a connection is
established. 
 > 
 > Tried all sorts of resetting ideas. New connection in System
Prefs>Network. Delete the plist files. I think I may have even
resolved this previously (many years ago). As it is a long time
between issues, I basically start from scratch each time to sort it. 
 > 
 > Many of the clips indicate resetting the Wifi network config will
resolve but not for this one. Seems I have a unique set of
circumstances here. 
 > 
 > I hope some of you may have some ideas.
 > 
 > Regards
 > 
 > 
 > Pete
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