I've got the same issue. I cannot reach the IP addresses but I can reach the domains.
Doesn't work: 192.168.1.101
Does work: internal.jrh.com (resolves to 192.168.1.101)
I see nothing in the web inspector, it just hangs. The page doesn't ever timeout.
Checking Wireshark when doing the connection I see 2-way traffic but no data on the page.

My version: Version 0.99.131.0.1-beta (WebKit 621.1.2.111.4)
OS Version: Version 15.3.1 (24D70)
Hardware: M2 Pro