SSL error in uptime after changing DNS to WPMUDEV

I changed my DNS this morning to your hosting, but have been receiving the following errors from Uptime:

Our systems have detected that your site – https://www.quad++++ws.co.uk/ – went down on Sep 12, 2019 5:50pm and is returning “Error: write EPROTO 140323805079360:error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure:../deps/openssl/openssl/ssl/record/rec_layer_s3.c:1536:SSL alert number 40

Chat agent seems to think this might clear up in due time, but wasn’t entirely 100% certain, we tried disabling uptime and re-activating it again.