macOS update - Players Fail to Connect to LMS

Recently updated to macOS 10.13.4. Now cannot connect any of my Squeezebox players (BOOM and RADIO).

Tried clean re-install of 7.9.1. Players connect to my squeezebox.com but not to LMS.

LMS appears to be running correctly. Accepts mysqueezebox.com password and says connected but Server log shows:-

[18-04-05 21:02:50.3031] Slim::Networking::SqueezeNetwork::_error (596) Unable to login to SN: Timed out waiting for data
[18-04-05 21:02:50.3032] Slim::Networking::SqueezeNetwork::_init_error (209) Unable to login to mysqueezebox.com, sync is disabled: Timed out waiting for data [link squeezebox dot com]
[18-04-05 21:02:50.3034] Slim::Networking::SqueezeNetwork::_init_error (223) mysqueezebox.com sync init failed: Timed out waiting for data, will retry in 300 [link squeezebox dot com]
[18-04-05 21:02:58.6878] Slim::Networking::SqueezeNetwork::_error (596) Unable to login to SN: Timed out waiting for data

I have searched solutions on forum but can't find a fix.

Can anyone help?

macOS High Sierra 10.13.4 : LMS 7.9.1 : 2xSBBoom : 1xSBRadio