Tag: connection

drivers – Specific versio of “activation of network connection failed” under Ubuntu 18.04

I have found many earlier questions here that at first glance, describe the same problem I am facing: the error message activation of network connection failed when trying to connect to any wi-fi network.

However, my case is rather particular in a few ways:

  • this problem appeared out of a sudden, after I rebooted my computer – that is, everything was working fine for more more than an year until minutes ago (also, I did not install any new software recently);
  • I can still see all wi-fi connections listed, but upon selection any, I get the error message (I did try forgetting/re-entering connections);
  • my Wi-Fi card (the one that has smoothly worked in the last year) is a PCI Express Wi-Fi adapter (so Ubuntu 18.04 – Activation of network connection failed does not help, and mine is not a duplicate of connection failed activation of network connection failed). More specifically, it is a FebSmart Wireless Dual Band N600 (2.4GHz 300Mbps or 5GHz 300Mbps). For reference, a lshw gives me the following wi-fi network (i.e. omitting Ethernet cards):
       *-network
            description: Wireless interface
            product: AR93xx Wireless Network Adapter
            vendor: Qualcomm Atheros
            physical id: 0
            bus info: pci@0000:02:00.0
            logical name: wlp2s0
            version: 01
            serial: e0:ca:94:c5:b0:57
            width: 64 bits
            clock: 33MHz
            capabilities: bus_master cap_list rom ethernet physical wireless
            configuration: broadcast=yes driver=ath9k driverversion=5.3.0-53-generic firmware=N/A latency=0 link=no

multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:dfe00000-dfe1ffff memory:dfe20000-dfe2ffff

Other relevant outputs:

description: Computer
width: 64 bits
capabilities: smp vsyscall32   *-core
   description: Motherboard
   physical id: 0
 *-memory
      description: System memory
      physical id: 0
      size: 251GiB
 *-cpu:0
      product: Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
      vendor: Intel Corp.
      physical id: 1
      bus info: cpu@0
      size: 1611MHz
      capacity: 3500MHz
      width: 64 bits
      capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts md_clear flush_l1d cpufreq

 *-cpu:1
      product: Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz
      vendor: Intel Corp.
      physical id: 2
      bus info: cpu@1
      size: 2130MHz
      capacity: 3500MHz
      width: 64 bits
      capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts md_clear flush_l1d cpufreq

And a iwconfiggives me:

wlp2s0 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=15 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
enp6s0 no wireless extensions.

enp7s0 no wireless extensions.

lo no wireless extensions.

enp9s0 no wireless extensions.

enp10s0 no wireless extensions.

What should I do to try to restore access through my PCI Express card, as I was just having minutes ago?

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notepadqq – snapd.socket: connect: connection refused

After an update or upgrade a lot of programs do not work anymore (they are in the ubuntu menu but they dont start), notepadqq is one of them. When I do “snap install notepadqq” in the console I get “error: cannot communicate with server: Post http://localhost/v2/snaps/notepadqq: dial unix /run/snapd.socket: connect: connection refused”. Please provide a layman answer. I just need my laptop back working.

The actual goal is to uninstall notepadqq but I think this is only possible when it is properly reinstalled, right? Thanks

OpenSSL fails to detect expired intermediate CA certificate in s_client SSL connection test

By accident, I have an expired intermediate certificate at the end of my chain file in my Dovecot server’s SSL configuration. It’s enough of a problem that my Android e-mail client refuses to use it, although Apple Mail lets it go (??!). Indeed, the expiration just happened hours ago. openssl x509 -in ... shows:

    Serial Number:
        13:ea:28:70:5b:f4:ec:ed:0c:36:63:09:80:61:43:36
    Signature Algorithm: sha384WithRSAEncryption
    Issuer: C = SE, O = AddTrust AB, OU = AddTrust External TTP Network, CN = AddTrust External CA Root
    Validity
        Not Before: May 30 10:48:38 2000 GMT
        Not After : May 30 10:48:38 2020 GMT
    Subject: C = US, ST = New Jersey, L = Jersey City, O = The USERTRUST Network, CN = USERTrust RSA Certification Authority

But this command:

openssl s_client -showcerts -verify_return_error -connect imap.example.com:993

fails to flag the problem (while outputting the expired certificate!). The OpenSSL package version is: 1.1.1g-1+ubuntu18.04.1+d

CONNECTED(00000003)
depth=2 C = US, ST = New Jersey, L = Jersey City, O = The USERTRUST Network, CN = USERTrust RSA Certification Authority
verify return:1
depth=1 C = GB, ST = Greater Manchester, L = Salford, O = Sectigo Limited, CN = Sectigo RSA Domain Validation Secure Server CA
verify return:1
depth=0 CN = imap.example.com
verify return:1

How do I create an OpenSSL verification test to find and flag this? I have searched online already quite a bit and found nothing to address expiration down a few rungs in a public chain. The closest question is: Why is my SSL certificate untrusted on Android? but this only deals with a missing link in a 4-certificate chain. My guess as to why Apple Mail accepts the error is that MacOS has cached its own non-expired version of the same intermediate CA.

Allowing Incoming Connection on Bitcoin Core

Good Evening,

I recently installed Bitcoin Core v0.12.1 on my home server (running Windows 7) and wanted to allow it to accept incoming connections and used the guide found here: https://bitcoin.org/en/full-node#windows-7 to ensure I did everything that was needed. Unfortunately, it hasn’t been showing any incoming connection and when I used the connection tool recommended in the guide (https://bitnodes.21.co/#join-the-network), it says my server is unreachable.

I have already setup port forwarding for port 8333 to both my server’s IP address, 192.168.1.105 (wireless) & 192.168.1.129 (ethernet). I ran a port scan on the following websites and they all indicate that Port 8333 is open:

  1. Ping.eu Port Check
  2. WhatMyIP Port Scanner
  3. T1 Shopper Port Scanner

(I would provide links for the above scanners, but I cannot post more than 2 links)

I also created two rules in Windows Firewall (under Inbound Rules) with the following properties:

  1. Local Port – 8333
  2. Remote Port – All Ports
  3. Scope – Local & Remote IP address set to Any IP Address
  4. Domain, Public, and Private all checked
  5. All programs that meet the specified conditions checked
  6. Set to allow the connection
  7. Rule is enabled

There are two rules with the above settings, one for TCP and one for UPD. Even with all the above setup, the “Join the Network” tool on Bitnodes website (second link from the top) still says my node is unreachable and the debug window inside the program shows 0 incoming connections and 8 outgoing connections.

I’m not sure what else needs to be setup since I completed everything in the guide and port 8333 is definitely open. Any help or information with this issue would be greatly appreciated. Thank you in advance.

Dominick

postgresql – server closed the connection unexpectedly PSQL copy

I have this error in my PostgreSQL 9.6 in google cloud and really don’t know why. When trying to export large tables via copy. The table size is more or less 30GB and 16GB.

COPY data transfer failed: server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.
server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.

I did quickly search in google and see these flag is important but I’m not sure if is true.

  • shared_buffers=>2492MB
  • temp_file_limit=>10268767kB.

And this is a configuration one Master and Salve

  • vCPU=>2
  • Memoria=>7,5 GB
  • SSD=>109 GB
  • PG 9.6

Any idea?

url – LinkedIn connection marked unsafe

From time to time my LinkedIn connection gets marked as unsafe: no green lock next to the URL.

First, I believed this was a browser issue, but after I switched to another browser, the warning did not disappear (for now, my browsers are Opera and Chrome).

First, connection is always safe, but once I enter job search section and start scrawling through job offers, every now and then, although not often, the safe connection status turns into unsafe. Any one has an idea of what may cause such change?

Thanks for your attention.

The enclosed images further illustrate my question.

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transit – 1 and a half hour connection time in Munich with different airlines

In terms of the timing, see this other question. More generally speaking, quite often airports will list suggested connecting times. Munich says 45 minutes minimum for transit if you’re changing terminals, so doubling that should be fairly comfortable.

In terms of your luggage – I would expect them to check your luggage through, and for there to be no need for you to see it again until you get to Canada. For your own peace of mind, just doublecheck when you check it in. They should be able to tag it all the way to YOW.

You will need to pick it up at YYZ, and return it to be put on your connecting flight after clearing customs.

wireless – No Wifi Connection on Ubuntu 18.04 running from Windows 10

I install Ubuntu 18.04 running from Windows 10 (not Dual-boot). However, there is no Wifi option (on Desktop top right, or bottom right corner).

Also, when I click on Network Connections, it does not respond. When I search for ‘WiFi’, it does not seem installed which is weird!

Any guidance would be appreciated.

enter image description here

online – How does “internet connection required” protect from piracy on mobile phones?

I don’t know how the DRM of this particular game works, because I do not work at Nintendo. But a common reason why DRM requires an always-on internet connection is because not every copy of the game is the same. Everyone who buys the game gets a copy with a different license key. While the player is playing the game, the license key is sent to the server. When a second player comes online with the exact same license key, then one of them is obviously playing a copy they didn’t buy.

When the game is bought through a store platform which assigns unique IDs to users or devices, you can also use an internet connection to verify purchase. The game sends the user/device ID to the server, and the server verifies that this user/device has actually bought that game.

As with every DRM scheme, this system is not bulletproof. No DRM scheme is bulletproof. When a game runs on the user’s hardware, it’s in the hands of the enemy. A determined hacker can find out where the game stores the license key and how to replace it with a different one. Or alternatively change the game executable so it will run without comparing the license key. But that takes some time to figure out. Most games make their most revenue during the first weeks after release. So the idea is not to deter the software pirates forever, but only until the launch weeks are over.