There isn't much in the NM logs, here's all I could find that seemed useful (no lines removed from these subsets)
No changes (both IPv4 & IPv6 set to default method) NetworkManager[18485]: <info> [1552542701.3933] device (wlp4s0): Activation: (wifi) Stage 2 of 5 (Device Configure) successful. Connected to wireless network "ESSID-V6Only" NetworkManager[18485]: <info> [1552542701.4132] device (wlp4s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed') NetworkManager[18485]: <info> [1552542701.4142] dhcp4 (wlp4s0): activation: beginning transaction (timeout in 45 seconds) NetworkManager[18485]: <info> [1552542701.4162] dhcp4 (wlp4s0): dhclient started with pid 18944 NetworkManager[18485]: <warn> [1552542746.1856] dhcp4 (wlp4s0): request timed out NetworkManager[18485]: <info> [1552542746.1857] dhcp4 (wlp4s0): state changed unknown -> timeout NetworkManager[18485]: <info> [1552542746.2175] dhcp4 (wlp4s0): canceled DHCP transaction, DHCP client pid 18944 NetworkManager[18485]: <info> [1552542746.2175] dhcp4 (wlp4s0): state changed timeout -> done NetworkManager[18485]: <info> [1552542746.2177] device (wlp4s0): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed') NetworkManager[18485]: <info> [1552542746.2180] manager: NetworkManager state is now DISCONNECTED NetworkManager[18485]: <info> [1552542746.2181] manager: startup complete NetworkManager[18485]: <warn> [1552542746.2185] device (wlp4s0): Activation: failed for connection 'ESSID-V6Only' NetworkManager[18485]: <info> [1552542746.2186] device (wlp4s0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed') IPv4 explicitly marked disabled: NetworkManager[18485]: <info> [1552542821.9833] device (wlp4s0): Activation: (wifi) Stage 2 of 5 (Device Configure) successful. Connected to wireless network "ESSID-V6Only" NetworkManager[18485]: <info> [1552542822.0137] device (wlp4s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed') NetworkManager[18485]: <info> [1552542854.1857] device (wlp4s0): state change: ip-config -> failed (reason 'ip-config-unavailable', sys-iface-state: 'managed') NetworkManager[18485]: <info> [1552542854.1862] manager: NetworkManager state is now DISCONNECTED NetworkManager[18485]: <warn> [1552542854.1869] device (wlp4s0): Activation: failed for connection 'ESSID-V6Only' NetworkManager[18485]: <info> [1552542854.1873] device (wlp4s0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
