Cannot connect to GitHub, Twitter, etc. Unable to connect to Server

Support Network
1

Hi there,
I had installed Arch Linux on my system and wanted to install yay… But after a while I found out I can’t connect to GitHub at all. Now I tried it with Manjaro and still cannot access the site (I only did this because I don’t know how to find out the answer needed for the registration on Arch forum. If you can help me to get it I’d appreciate it).
Sites like DuckDuckGo, Twitter and GitHub don’t wanna connect. YouTube and Google however work just fine. If you can help me it would be really nice.

Greetings,
J K

PS: I think it is something with my network configuration like DNS and such since I can connect to the sites from my main PC.

2

Hi @JLK2506, and welcome!

It does sound like some kind of DNS issue. Do you know if the 2 machines have the same DNS setting?

That would bee my guess, as to why this is happening. Try and set the problematic one’s primary DNS server to 8.8.8.8. (You can change it later if you don’t want to keep it.)

1 Like
3

I went into the connection settings and set 8.8.8.8 as my DNS server under Other DNS Servers in both IPv4 and IPv6. Still doesn’t connect…

4

Please post the output of

dig github.com
curl https://github.com -v -o testfile

If dig command is not found, install the package bind

Encapsulate the output text with three backticks ``` (beginning and end)

5

Uhhhh… So I tried the dig command… It wasn’t found and as I did pacman -S bind it gave out the following:

warning: database file for 'extra' does not exist (use '-Sy' to download)
warning: database file for 'community' does not exist (use '-Sy' to download)
warning: database file for 'multilib' does not exist (use '-Sy' to download)
error: target not found: bind```
6 
sudo pacman -Syu bind
7

Only gives out the following:

error: failed to update extra (no servers configured for repository)
error: failed to update community (no servers configured for repository)
error: failed to update multilib (no servers configured for repository)
error: failed to synchronize all databases```
8

You don’t seem to have any mirrors configured :thinking:

sudo pacman-mirrors --geoip

then install again

9

Thanks… I did retype the command and it also made a full system update. But so it also updated Network Manager and then I restarted to see if it would work and still can’t connect. But at least I can run the two commands you mentioned.

dig github.com gives:

; <<>> DiG 9.16.13 <<>> github.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57563
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;github.com.                    IN      A

;; ANSWER SECTION:
github.com.             59      IN      A       140.82.121.3

;; Query time: 10 msec
;; SERVER: fd00::f2b0:14ff:fe31:32c0#53(fd00::f2b0:14ff:fe31:32c0)
;; WHEN: So Mai 02 13:56:28 CEST 2021
;; MSG SIZE  rcvd: 55```

```curl https://github.com -v -o testfile``` gives:
```  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying 140.82.121.4:443...
* Immediate connect fail for 140.82.121.4: Network is unreachable
* Closing connection 0
curl: (7) Couldn't connect to server```

PS: Ending these backticks doesn't seem to work properly...
10

looks like some routing issue.

please post route

11

bash: route: command not found

What do I need to install in order for it to work?

12

net-tools

also post nmcli

13

route output is:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.10.0 0.0.0.0 255.255.255.0 U 600 0 0 wlp3s0

And nmcli gives me:
wlp3s0: connected to FRITZ!Box 7560 ST
“Qualcomm Atheros AR9285”
wifi (ath9k), D0:DF:9A:D4:D9:29, hw, mtu 1500
ip6 default
inet4 192.168.10.101/24
route4 192.168.10.0/24
inet6 2003:d7:7f43:fc00:1a1a:f5ab:cd5f:6950/64
inet6 fe80::6bb5:1653:3b8a:fcd/64
route6 2003:d7:7f43:fc00::/56
route6 2003:d7:7f43:fc00::/64
route6 ::/0
route6 ff00::/8
route6 fe80::/64

p2p-dev-wlp3s0: disconnected
“p2p-dev-wlp3s0”
wifi-p2p, hw

enp5s0: unavailable
“Realtek RTL8111/8168/8411”
ethernet (r8169), E0:69:95:76:5E:33, hw, mtu 1500

lo: unmanaged
“lo”
loopback (unknown), 00:00:00:00:00:00, sw, mtu 65536

DNS configuration:
servers: fd00::f2b0:14ff:fe31:32c0 ::ffff:8.8.8.8
interface: wlp3s0
servers: 192.168.178.87 8.8.8.8
domains: Repeater
interface: wlp3s0

Use “nmcli device show” to get complete information about known devices and
“nmcli connection show” to get an overview on active connection profiles.

Consult nmcli(1) and nmcli-examples(7) manual pages for complete usage details.

14

You seem to be missing the default route. How did you setup the network connection?
Did you put a static IP rather using DHCP?

Also what is weird is that you are in 192.168.10.0 network and your first DNS server is 192.168.178.87
By default the fritz boxes should have 192.168.178.1

15

I’m using DHCP

16

What’s the address of your router? to me this looks you messed something up on the router.

17

The IP of the router is 192.168.178.1. At least it should be… Since I didn’t change anything on the router

18

This is odd, you should be in the same network then rather than 192.168.10.0/24.
Did you modify the DHCP server settings on the fritzbox?

Anyways, try this command route add default gw 192.168.178.1 wlp3s0

19

I’m guessing that IPv4 is misconfigured and some things work through IPv6. But it’s just an idea.

20

Yeah, he is missing the default v4 route and only IPv6 is working which is why he can connect to certain websites.