On second look I found logs in the console:
Release
22:19:09.060937
com.apple.WebKit.Networking
TIC TCP Conn Start [17:0x7fe34f710a30]
Release
22:19:09.196801
com.apple.WebKit.Networking
TIC TCP Conn Event [17:0x7fe34f710a30]: 1 Err(0)
Release
22:19:09.196836
com.apple.WebKit.Networking
TIC TCP Conn Connected [17:0x7fe34f710a30]: Err(0)
Release
22:19:09.197087
com.apple.WebKit.Networking
TIC Enabling TLS [17:0x7fe34f710a30]
Error
22:19:09.330557
com.apple.WebKit.Networking
nw_coretls_read_one_record tls_handshake_process: [-9824]
Release
22:19:09.331145
com.apple.WebKit.Networking
TIC TCP Conn Event [17:0x7fe34f710a30]: 3 Err(-9824)
Release
22:19:09.331208
com.apple.WebKit.Networking
TIC TCP Conn Cancel [17:0x7fe34f710a30]
Release
22:19:09.331283
com.apple.WebKit.Networking
TIC TCP Conn Destroyed [17:0x7fe34f710a30]
Release
22:19:09.331719
com.apple.WebKit.Networking
NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9824)
Error
22:19:09.331833
com.apple.WebKit.Networking
HTTP load failed (error code: -1200 [3:-9824])
Error
22:19:09.331982
com.apple.WebKit.Networking
NSURLSessionTask finished with error - code: -1200
Release
22:19:09.332246
com.apple.WebKit.Networking
#WK: Failed loading network resource: loader = 0x11a59e3c0, pageID = 17, frameID = 1, isMainResource = 1, isSynchronous = 0, isTimeout = 0, isCancellation = 0, errCode = -1200
Release
22:19:09.332594
symptomsd
NDFSM: auto bug capture is administratively OFF, ignoring symptom with key: 421893
Release
22:19:09.332849
com.apple.WebKit.WebContent
#WK: WebResourceLoader::didFailResourceLoad, WebResourceLoader = 0x117381b58