Upgraded my iPhone XR from iOS 13 to iOS 14. I am. seeing same issue with both Safari on both WiFi and Cellular connections.
Running a DNS tool query from iPhone resolve ***.google.com host name to a correct IP address so this seems specific to Safari.
Following inspector log entries shows Safari internal Network Reachabililty or DNS failure on ***.google.com website (NOTE: the hostname ***.google.com appears in reply because www. prefix is not allowed in this reply ) :
Timestamp Type Process Subsystem Category Thread Message
00:28.988.415 Debug SpringBoard (59) com.apple.FrontBoard AppDataStore SpringBoard 0x3c4 fetching object for key=SBScenes bundleID=com.apple.mobilesafari (synchronously)
00:28.988.523 Debug SpringBoard (59) com.apple.FrontBoard AppDataStore SpringBoard 0x3c4 checking for prefetched object for key=SBScenes bundleID=com.apple.mobilesafari
00:28.988.669 Debug MobileSafari (1001) com.apple.SystemConfiguration SCNetworkReachability MobileSafari 0x3d44a [0x109625670] create w/name <SCNetworkReachability 0x109625670 [0x203068660]> {name = ***.google.com}
00:28.988.713 Debug SpringBoard (59) com.apple.FrontBoard AppDataStore SpringBoard 0x3c4 found object n/a
00:28.988.714 Debug MobileSafari (1001) com.apple.SystemConfiguration SCNetworkReachability MobileSafari 0x3d44a [0x109625670] scheduled
00:28.988.892 Debug SpringBoard (59) com.apple.FrontBoard AppDataStore SpringBoard 0x3c4 found prefetched object: n/a
00:28.988.971 Default MobileSafari (1001) com.apple.network path MobileSafari 0x3d44a nwpathevaluatorstart [16 Bytes Hostname#e6698e47:0 generic, multipath service: 3, indefinite]
path: satisfied (Path is satisfied), interface: en0, ipv4, dns
00:28.988.996 Info MobileSafari (1001) com.apple.network MobileSafari 0x3d453 nwresolvercreatednsgetaddrinfolocked Starting host resolution Hostname#e6698e47:0, flags c000d000 proto 0 using hostname: <NO HOSTNAME>
00:28.989.021 Info SpringBoard (59) com.apple.FrontBoard AppDataStore SpringBoard 0x3c4 setting object for key=SBScenes bundleID=com.apple.mobilesafari object=n/a
00:28.989.026 Error MobileSafari (1001) com.apple.mobilesafari PageLoading MobileSafari 0x3d44a Displaying webpage loading error to user: Error Domain=NSURLErrorDomain Code=-1004 "(null)", networkTaskDescription: LocalDataTask <4B48C5ED-E3D8-4006-B8D3-6B25B05E4205>.<3>.
00:28.989.120 Debug MobileSafari (1001) com.apple.CFBundle strings MobileSafari 0x3d44a Bundle: n/a, key: Safari cannot open the page because it could not connect to the server., value: localized string not found, table: Localizable, localizationName: , result: Safari cannot open the page because it could not connect to the server.
00:28.989.154 Debug SpringBoard (59) com.apple.FrontBoard AppDataStore SpringBoard 0x3c4 updating cache key=SBScenes bundleID=com.apple.mobilesafari object=n/a
00:28.989.164 Default mDNSResponder (136) com.apple.mDNSResponder Default mDNSResponder 0x3d4df [R319,573] getaddrinfo start -- flags: 0xc000d000, ifindex: 0, protocols: 0, hostname: n/a, options: {}, client pid: 1,001 (MobileSafari)
