"some, not all sites state "Unable to connect", wile others just work fine

[Huib]

L.S.
Fresh installed Linux Mint 21.1 Cinnamon. Some sites show up flawless (for instance https://keepassxc.org/download/#linux;
https://freefilesync.org/download.php and https://wikipedia.org) but most approaches render "Unable to Connect". examples are "startpage.com", "https://www.linuxmint.com" and many more.
There is a wired connection AND a wireless connection. Switching off the wireless one didn't change a thing.
Who can give me a clue what's wrong here?

Some patience will be helpful! Please, a step by step approach as Linux still is quite confusing!
Thank you!


PS.: my W10-PC, using the same router; wired connection also, works just fine.
PS 2.: looking to the wired connection I see:
connected - 100 Mb/s
IPv4 Address 192.168.178.26 #that's also the IP-address Slitheris reports for that PC
Default route Fe80::6a02:b8ff:fe71:617a
DNS4 192.168.178.1 #the address of the router. slitheris reports also that address for the router
DNS6 2001:730:3e42::53 2001:730:3e42:1000::53

 

[Condobloke]

G'day Huib, Welcome to Linux.org

Which browser are you using?

Have you made any other changes to 21.1 since installing it ?

Have you installed available updates since the installation. These will be via the Update Manager, which is usually found via a shield shaped icon in the system tray (down near the clock) or via the Menu by typing Update Manager in there.
If updates are available, install them all.

 

[APTI]

I was seeing this issue yesterday. it may not be you it may be your service provider. There was something going on yesterday all over the internet.

 

[Huib]

G'day Huib, Welcome to Linux.org

Which browser are you using?

Have you made any other changes to 21.1 since installing it ?

Have you installed available updates since the installation. These will be via the Update Manager, which is usually found via a shield shaped icon in the system tray (down near the clock) or via the Menu by typing Update Manager in there.
If updates are available, install them all.

First of all: thank you for your kind help: highly appreciated!
I use Firefox, but, as a way to find out where the culprit is, I also installed Falcon and Brave. That didn't change a thing: exactly the same trouble. So Falcon and Brave are removed: I don't like a cluttered machine.
I didn't change anything of the installed Linux (Mint 21.1, Cinnamon).
The update manager works fine: I have got several updates, which I all accepted. I see updates as a safety measure.
The software manager also works as it should: I have, for instance, installed Calibre using the software manager.
In the 70th, as a student, I had to work on HP-unix machines. That was hard to learn, but within four weeks I had installed deamons on each machine, that interpreted (using tail) what I did send to them in a file, as commands. So I could run tasks on all three of them, which, being a student, was n't appreciated by the staff.
In those 55 years a lot has changed: I'm a newby now... so help is VERY welcome!

 

[Huib]

First of all: thank you for your kind help: highly appreciated!
I use Firefox, but, as a way to find out where the culprit is, I also installed Falcon and Brave. That didn't change a thing: exactly the same trouble. So Falcon and Brave are removed: I don't like a cluttered machine.
I didn't change anything of the installed Linux (Mint 21.1, Cinnamon).
The update manager works fine: I have got several updates, which I all accepted. I see updates as a safety measure.
The software manager also works as it should: I have, for instance, installed Calibre using the software manager.
In the 70th, as a student, I had to work on HP-unix machines. That was hard to learn, but within four weeks I had installed deamons on each machine, that interpreted (using tail) what I did send to them in a file, as commands. So I could run tasks on all three of them, which, being a student, was n't appreciated by the staff.
In those 55 years a lot has changed: I'm a newby now... so help is VERY welcome!

By the way: there is a wired and a wifi connection. In order to avoid confusion I didn't connect the wifi to my router, so the only connection is the wired one.

 

[CaffeineAddict]

DNS4 192.168.178.1 #the address of the router. slitheris reports also that address for the router

I suggest you to change DNS to something stable like public google DNS.

 

[Huib]

L.S.
Don't understand, but.... problem solved??!!
I added the wireless connection and hocus pocus now ALL sites are working.....
Why???? I had a wired connection, that was up and running: the proof of it was that updates and software management worked fine. Now, after adding the wifi connection all sites I try work; no longer "unable to connect". When someone has an explanation: please, tell me!

 

[Huib]

Everybody who was so kind to react: THANK YOU!!!

 

[Brickwizard]

From Mint terminal, Run inxi -Nn and paste back the results

 

[Condobloke]

L.S.

??

 

[Huib]

Much of who you ask I did include:
*Linux Mint 21.1 Cinnamon,
in the meantime updated to 21.3

• firefox browser
• remedy:

-updates and software manger work fine, so
the wired connection is up and running
- removed all history and cache from Firefox
-two other browsers have been installed (Brave and
falcon) to make sure it's not the browser.
Hardware:

• MSI motherbord MS-7846
• Intel Core i5-4460 32. GHz x 4
• memory 7.7 GB
• Graphics AMD Tahiti PRO [Radeon HD 7950/8950 OEM]

*Audio device: Tahiti HDMI [Radeon HD 7870 XT]
*network: Wireless 7260, Intel. clock 33 MHz
*network: Ethernet RTL8111/8168 Realtek 100 Mb/s

But it is still unclear to me that with a working wired connection (proved by being able to get updates and successfully run the software manager) I can get SOME sites while others render "unable to connect", the problem magically disappearing after making a wifi connection.
Have a good night!

 

[Brickwizard]

the problem magically disappearing after making a wifi connection.

Sounds weird to me as well, all i can suggest is make sure you have the correct drivers for both the RTL controller and the Intel Wi-Fi

 

[Huib]

O, the machine has been composed, several years ago, by my son in law, so there is no "Make" or model nr.

 

[hacktheworld]

L.S.
Fresh installed Linux Mint 21.1 Cinnamon. Some sites show up flawless (for instance https://keepassxc.org/download/#linux;
https://freefilesync.org/download.php and https://wikipedia.org) but most approaches render "Unable to Connect". examples are "startpage.com", "https://www.linuxmint.com" and many more.
There is a wired connection AND a wireless connection. Switching off the wireless one didn't change a thing.
Who can give me a clue what's wrong here?

Some patience will be helpful! Please, a step by step approach as Linux still is quite confusing!
Thank you!


PS.: my W10-PC, using the same router; wired connection also, works just fine.
PS 2.: looking to the wired connection I see:
connected - 100 Mb/s
IPv4 Address 192.168.178.26 #that's also the IP-address Slitheris reports for that PC
Default route Fe80::6a02:b8ff:fe71:617a
DNS4 192.168.178.1 #the address of the router. slitheris reports also that address for the router
DNS6 2001:730:3e42::53 2001:730:3e42:1000::53

L.S.
Fresh installed Linux Mint 21.1 Cinnamon. Some sites show up flawless (for instance https://keepassxc.org/download/#linux;
https://freefilesync.org/download.php and https://wikipedia.org) but most approaches render "Unable to Connect". examples are "startpage.com", "https://www.linuxmint.com" and many more.
There is a wired connection AND a wireless connection. Switching off the wireless one didn't change a thing.
Who can give me a clue what's wrong here?

Some patience will be helpful! Please, a step by step approach as Linux still is quite confusing!
Thank you!


PS.: my W10-PC, using the same router; wired connection also, works just fine.
PS 2.: looking to the wired connection I see:
connected - 100 Mb/s
IPv4 Address 192.168.178.26 #that's also the IP-address Slitheris reports for that PC
Default route Fe80::6a02:b8ff:fe71:617a
DNS4 192.168.178.1 #the address of the router. slitheris reports also that address for the router
DNS6 2001:730:3e42::53 2001:730:3e42:1000::53

I suggest you reinstall Linux Mint, maybe it solves the problem given the fact that it is difficult to identify what the network problem is.

 

[dos2unix]

I think @CaffeineAddict hit it on the head.
Probably DNS related it happens from time to time. Especially if you change your connection type and it started working.
Every now and then my ISP loses a root name server or two.

Sometimes when you switch from a static IP to a dhcp address it can fix or break things.

 

[truckerDave]

I can confirm what @APTI said above. I was having issues as well. Youtube and yahoo was darn near the only pages that would load for me.