I've noticed that my Mac will intermittently stop performing network request. I can see these error message in Console around the time when I notice network issues.
6/11/15 10:31:20.379 AM networkd[161]: -[NETProxyLookup copyURL] invalid URL scheme '5223'
6/11/15 10:32:29.139 AM networkd[161]: -[NETProxyLookup copyURL] invalid URL scheme '5223'
6/11/15 10:33:39.135 AM networkd[161]: -[NETProxyLookup copyURL] invalid URL scheme '5223'
6/11/15 10:33:47.990 AM mDNSResponder[85]: nw_interface_get_agents SIOCGIFAGENTIDS failed (errno = 6)
6/11/15 10:33:47.990 AM mDNSResponder[85]: nw_interface_get_agents SIOCGIFAGENTIDS failed (errno = 6)
6/11/15 10:34:54.126 AM networkd[161]: -[NETProxyLookup copyURL] invalid URL scheme '5223'
6/11/15 10:35:57.161 AM mDNSResponder[85]: nw_interface_get_agents SIOCGIFAGENTIDS failed (errno = 6)
6/11/15 10:35:57.161 AM mDNSResponder[85]: nw_interface_get_agents SIOCGIFAGENTIDS failed (errno = 6)
Anyone else with the Beta experiencing this? If I boot from OS X 10.10.3 on the same machine I do not experience the same network issues.