Fedora 34 - x86_64 Errors during downloading metadata for repository 'fedora'

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3

Is your Fedora guest otherwise “online”?

Yes. The newly upgraded Fedora 34 (guest) from Fedora 32 (guest) can still connect to internet via the VirtualBox (Windows 7; host). I have used Firefox to check gmail and yahoo, and the connection was slightly slow.

You said the ping took long, can you ping from your host OS?

Yes, I can still ping google from my Windows 7 (host).

That host OS is outdated, maybe Virtualbox does not support it anymore, you should upgrade to Win10 (0$).

I run Fedora 30 (guest) using the same VirtualBox (Windows 7; host) at the same time. There is no problem for this Fedora 30 to get online.

I suppose/hope this is not due to Windows 7.

You can surf the web and lookup domains ( nslookup google.com )

The response of nslookup is negative:

[XXX@localhost ~]$ nslookup google.com
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	google.com
Address: 172.217.31.78
;; connection timed out; no servers could be reached


[XXX@localhost ~]$

There is no problem for pinging google.

[XXX@localhost ~]$ ping google.com
PING google.com (216.58.203.78) 56(84) bytes of data.
64 bytes from kul09s03-in-f14.1e100.net (216.58.203.78): icmp_seq=1 ttl=111 time=10.6 ms
64 bytes from kul09s03-in-f14.1e100.net (216.58.203.78): icmp_seq=2 ttl=111 time=9.40 ms
...
...
64 bytes from kul09s03-in-f14.1e100.net (216.58.203.78): icmp_seq=12 ttl=111 time=7.62 ms
64 bytes from kul09s03-in-f14.1e100.net (216.58.203.78): icmp_seq=13 ttl=111 time=11.1 ms
^C
--- google.com ping statistics ---
13 packets transmitted, 13 received, 0% packet loss, time 12020ms
rtt min/avg/max/mdev = 7.618/8.951/11.058/1.193 ms
[XXX@localhost ~]$

For the below suggestions,

re DNS, look at: DNS resolution broken - #2 by vgaetera and Resolvectl connection timed out but google chrome working fine

I tried this command:
sudo nmcli connection show

There is no output message. Shall I proceed to

sudo nmcli connection modify id CON_NAME \
    ipv4.ignore-auto-dns yes \
    ipv6.ignore-auto-dns yes \
    ipv4.dns 8.8.8.8,8.8.4.4
sudo nmcli connection up id CON_NAME

If the suggestion is not successful, may I know how to restore to the previous configuration?

Your suggestions and help are very appreciated.