i have een suffering past week this same issue from fresh boot and i am running out of ideas why ipv6 is disaled and permission denied
logs keeps spamming 10 messages on every second on same issue
02:11:28.060 UTC NetworkManager.service <warn> [1729303888.0607] platform-linux: do-add-ip6-address[2: fe80::8639:6e35:e082:2e2]: failure 13 (Permission denied - ipv6: IPv6 is disabled on this device)
02:11:28.061 UTC NetworkManager.service <warn> [1729303888.0609] l3cfg[c65a58a8c3822913,ifindex=2]: unable to configure IPv6 route: type unicast fe80::/64 dev 2 metric 1024 mss 0 rt-src ipv6ll
02:11:30.062 UTC NetworkManager.service <warn> [1729303890.0620] platform-linux: do-add-ip6-address[2: fe80::80a1:65e:aa27:db04]: failure 13 (Permission denied - ipv6: IPv6 is disabled on this device)
02:11:32.063 UTC NetworkManager.service <warn> [1729303892.0633] platform-linux: do-add-ip6-address[2: fe80::b92c:7ecf:8cb6:a9ec]: failure 13 (Permission denied - ipv6: IPv6 is disabled on this device)
02:11:33.461 UTC NetworkManager.service <warn> [1729303893.4615] ndisc[0x562a1dc25480,"enp0s20f0u1u1"]: solicit: failure sending router solicitation: Cannot assign requested address (99)
02:11:34.064 UTC NetworkManager.service <warn> [1729303894.0639] platform-linux: do-add-ip6-address[2: fe80::d4d0:d5f3:fe5b:2216]: failure 13 (Permission denied - ipv6: IPv6 is disabled on this device)
02:11:35.352 UTC session-c1.scope file:///usr/share/sddm/themes/01-breeze-fedora/Main.qml:230:17 Parameter "username" is not declared. Injection of parameters into signal handlers is deprecated. Use JavaScript functions with formal parameters instead.
seems like it is on onfig to disable ipv6 and i havent done that one fresh install and updates from test repos only it was happenin already even i install VPN and if i uninstall VPN and purge all this is still going on
On F40 KDE I have IPv6 all good and running when I connect to VPN network manager goes limited connectivity mode and it also blocks kde apps using internet
Even I disable VPN the IPv6 is still disabled won’t go back to default settings
When VPN is disabled all KDE apps connect again yesterday network and network manager is not limited connectivity mode
On F41 beta have more issues including plasma dumbed core, kontact dumbed core just for example
Disabling IPv6 is a well-known method to prevent traffic leaks, especially when using IPv4-only VPNs, but there are some caveats:
Being IPv4-only in 2024 is a sign of technological backwardness, not something that a really good VPN provider should do.
Certain VPN apps like Outline disable IPv6 globally, hiding even loopback and link-local addresses, which creates potential problems for services listening on the localhost socket.
Possible solutions:
Make the VPN app stop messing with IPv6, or just stop using the app and set up the VPN connection in NetworkManager.
Switch to a different VPN provider that supports dual-stack, or set up a self-hosted dual-stack VPN on a VPS.