Cannot connect to any cloud based services...

New to these forums, but I'm really stumped and could use some help. I'm running a mid 2011 27" iMac, OSX 10.9.5... and for the last couple of days I have not been able to connect to any cloud based services - Adobe CC, Dropbox, Google Drive etc that are on the menu bar (icons are greyed out), nor does the App Store connect - no error message there, just a blank App Store template window...

• Browsers are working fine and I can connect to the web based interfaces of these apps (ie I can login to my Dropbox account and see my folders via Chrome).
• My Macbook Pro on the same wifi connection and network is working fine.
• An older version of OSX on another internal drive also works fine if I boot up with that.
• Another user on this version of OSX also cannot connect to these services.
• I have reset the modem / router. I have restarted the iMac about 9 times.
• I haven't changed any network settings that I'm aware of.
• I tried restoring with Time Machine to a couple of days ago, but then discovered it is still pointing at the old version of OSX on the other internal drive - doh!

Any suggestions?

Thanks, Jake

 

No, no firewall and no anti virus software

 

Booting in Safe Mode does not make any difference...

 

For Adobe Creative Cloud after restart, I'm getting tons of messages that say:

• "configd: dnssd_clientstub ConnectToServer: connect ()-> No of tries: 3" etc
• "configd: dnssd_clientstub ConnectToServer: connect () failed Socket:9 Err:-1 Errno:2 No such file or directory" (also Socket:12)
• "configd: DNSServiceCreateConnection(&dnsMain) failed, error = -65563

I have no idea what any of that means. I would send a screenshot but screenshots save to dropbox and that won't sync, soI'm not getting any of them...

 

Yes I did that yesterday. I thought they were already the Google DNS settings but when I checked them (yesterday) the DNS fields were populated with my router address (192.168.1.1) which was weird, but I changed them and it hasn't made any difference...