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Browser Development • How can a website/browser change internal Linux connection settings?

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Update. Rebooting (with standard IPv6 setings) and going to Mymerrill.com again, connection was lost even before login.

Sysctl showed no sifnificant changes, only an increase in "kernel.random.entropy_avail" from 882 (when working) to 911 (when no ping to anywhere except the local machine's address, but shown connected).

Netstat showed:

CODE:

Active Internet connections (w/o servers)Proto RecvQ SendQ Local Address           Foreign Address         State      udp        0    704 192.168.86.49:38205     8.8.8.8:domain          ESTABLISHEDudp        0    704 192.168.86.49:43916     8.8.8.8:domain          ESTABLISHEDudp        0    704 192.168.86.49:48141     192.168.86.1:domain ESTABLISHEDudp        0      0 192.168.86.49:36044     192.168.86.1:domain ESTABLISHEDudp        0      0 192.168.86.49:39120     192.168.86.1:domain ESTABLISHEDudp        0      0 192.168.86.49:43737     8.8.8.8:domain          ESTABLISHEDActive UNIX domain sockets (w/o servers)Proto RefCnt Flags       Type       State         I-Node   Pathunix  4      [ ]         DGRAM                    6468     /dev/logunix  3      [ ]         DGRAM                    2468     unix  3      [ ]         STREAM     CONNECTED     24931    unix  3      [ ]         STREAM     CONNECTED     8523     unix  3      [ ]         STREAM     CONNECTED     24710    unix  3      [ ]         STREAM     CONNECTED     24873    @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     16777    @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     7145     unix  3      [ ]         STREAM     CONNECTED     8162     @/tmp/dbus-PbwPHLeHGmunix  3      [ ]         STREAM     CONNECTED     7500     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8155     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8072     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     3642983  unix  3      [ ]         STREAM     CONNECTED     7250     unix  3      [ ]         STREAM     CONNECTED     16776    unix  3      [ ]         STREAM     CONNECTED     8339     @/tmp/.X11-unix/X0unix  2      [ ]         DGRAM                    1405     unix  3      [ ]         STREAM     CONNECTED     24927    unix  3      [ ]         STREAM     CONNECTED     24918    @/tmp/dbus-PbwPHLeHGmunix  3      [ ]         STREAM     CONNECTED     18279    unix  3      [ ]         STREAM     CONNECTED     24793    unix  3      [ ]         STREAM     CONNECTED     1762989  unix  3      [ ]         STREAM     CONNECTED     7146     /var/run/dbus/system_bus_socketunix  3      [ ]         STREAM     CONNECTED     8187     unix  3      [ ]         STREAM     CONNECTED     7591     unix  3      [ ]         STREAM     CONNECTED     6747     unix  3      [ ]         STREAM     CONNECTED     25066    @/tmp/dbus-PbwPHLeHGmunix  3      [ ]         STREAM     CONNECTED     8158     unix  3      [ ]         STREAM     CONNECTED     8099     unix  3      [ ]         STREAM     CONNECTED     7251     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8144     unix  2      [ ]         DGRAM                    15648    unix  3      [ ]         STREAM     CONNECTED     24928    @/tmp/dbus-PbwPHLeHGmunix  3      [ ]         STREAM     CONNECTED     8338     unix  3      [ ]         STREAM     CONNECTED     24917    unix  3      [ ]         STREAM     CONNECTED     24794    @/tmp/dbus-PbwPHLeHGmunix  3      [ ]         STREAM     CONNECTED     18278    unix  3      [ ]         STREAM     CONNECTED     8188     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     7237     unix  3      [ ]         STREAM     CONNECTED     1762990  @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8276     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     7592     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     7144     unix  3      [ ]         STREAM     CONNECTED     25065    unix  3      [ ]         STREAM     CONNECTED     24686    unix  3      [ ]         STREAM     CONNECTED     8159     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8145     unix  3      [ ]         STREAM     CONNECTED     8100     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8524     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     24932    /var/run/dbus/system_bus_socketunix  3      [ ]         DGRAM                    2467     unix  3      [ ]         STREAM     CONNECTED     6746     unix  2      [ ]         DGRAM                    6470     unix  3      [ ]         STREAM     CONNECTED     24872    unix  3      [ ]         STREAM     CONNECTED     7499     unix  3      [ ]         STREAM     CONNECTED     24709    unix  3      [ ]         STREAM     CONNECTED     8161     unix  3      [ ]         STREAM     CONNECTED     7147     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     24687    @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8071     unix  3      [ ]         STREAM     CONNECTED     3642984  @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8275     unix  3      [ ]         STREAM     CONNECTED     7238     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8154     
In summary, there were:
no tcp connections
6 udp connections to DNS servers or the local gateway
6 datagram Unix sockets
58 connected stream Unix sockets

The local gateway, a Google Mesh network, specifies that itself (192.168.86.1) be the primary DNS server, 8.8.8.8 was set as secondary. That has been the setup since it was installed 5 yrs ago.

After rebooting and ethernet reconnected (but no applications started), netstat showed:

CODE:

Active Internet connections (w/o servers)Proto Recv-Q Send-Q Local Address           Foreign Address         State      Active UNIX domain sockets (w/o servers)Proto RefCnt Flags       Type       State         I-Node   Pathunix  4      [ ]         DGRAM                    6470     /dev/logunix  3      [ ]         STREAM     CONNECTED     8153     unix  3      [ ]         STREAM     CONNECTED     8191     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8082     unix  3      [ ]         STREAM     CONNECTED     8163     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     7509     unix  3      [ ]         STREAM     CONNECTED     54792    @/tmp/.X11-unix/X0unix  2      [ ]         DGRAM                    6472     unix  3      [ ]         STREAM     CONNECTED     8347     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     7249     @/tmp/.X11-unix/X0unix  2      [ ]         DGRAM                    1405     unix  3      [ ]         STREAM     CONNECTED     12021    unix  3      [ ]         STREAM     CONNECTED     10490    unix  3      [ ]         STREAM     CONNECTED     6979     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8111     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8158     unix  3      [ ]         STREAM     CONNECTED     7716     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8152     unix  3      [ ]         STREAM     CONNECTED     8165     unix  3      [ ]         STREAM     CONNECTED     54791    unix  2      [ ]         DGRAM                    9352     unix  3      [ ]         DGRAM                    2468     unix  3      [ ]         STREAM     CONNECTED     8346     unix  3      [ ]         STREAM     CONNECTED     12020    unix  3      [ ]         STREAM     CONNECTED     7248     unix  3      [ ]         STREAM     CONNECTED     6951     unix  3      [ ]         STREAM     CONNECTED     8110     unix  3      [ ]         STREAM     CONNECTED     7663     unix  3      [ ]         STREAM     CONNECTED     8159     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8166     @/tmp/dbus-wqlXsXtyQPunix  3      [ ]         STREAM     CONNECTED     8491     @/tmp/.X11-unix/X0unix  3      [ ]         DGRAM                    2467     unix  3      [ ]         STREAM     CONNECTED     7262     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8306     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     6976     /var/run/dbus/system_bus_socketunix  3      [ ]         STREAM     CONNECTED     6753     unix  3      [ ]         STREAM     CONNECTED     6754     unix  3      [ ]         STREAM     CONNECTED     8190     unix  3      [ ]         STREAM     CONNECTED     8083     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8305     unix  3      [ ]         STREAM     CONNECTED     8162     unix  3      [ ]         STREAM     CONNECTED     7510     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8490     unix  3      [ ]         STREAM     CONNECTED     7261     unix  3      [ ]         STREAM     CONNECTED     6975     unix  3      [ ]         STREAM     CONNECTED     10491    @/tmp/.X11-unix/X0
There are:
no udp or tcp connections
6 datagram Unix sockets
40 connected stream Unix sockets

Starting Palemoon (28.16.0) with only the "Restore Session" tab shows 1 tcp connection:
tcp 0 0 192.168.86.49:51786 172.67.20.48:443 ESTABLISHED
6 datagram Unix sockets
56 connected stream Unix sockets

Being curious about 172.67.20.48 I tried:

CODE:

https://172.67.20.48/Secure Connection FailedAn error occurred during a connection to 172.67.20.48.Cannot communicate securely with peer: no common encryption algorithm(s).(Error code: SSL_ERROR_NO_CYPHER_OVERLAP)    The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.    Please contact the website owners to inform them of this problem.
and

CODE:

http://172.67.20.48/Error 1003 Ray ID: 852622bc48bd4327 • 2024-02-08 19:03:58 UTCDirect IP access not allowedWhat happened?You've requested an IP address that is part of the Cloudflare network. A valid Host header must be supplied to reach the desired website.What can I do?If you are interested in learning more about Cloudflare, please visit our website.
So DNS is involved in opening PM?

With tabs restored and editing at forum.palemoon.org, netstat shows:

CODE:

Active Internet connections (w/o servers)Proto Recv-Q Send-Q Local Address           Foreign Address         State      Active UNIX domain sockets (w/o servers)Proto RefCnt Flags       Type       State         I-Node   Pathunix  4      [ ]         DGRAM                    6470     /dev/logunix  3      [ ]         STREAM     CONNECTED     8153     unix  3      [ ]         STREAM     CONNECTED     8191     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8082     unix  3      [ ]         STREAM     CONNECTED     8163     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     7509     unix  3      [ ]         STREAM     CONNECTED     148175   unix  3      [ ]         STREAM     CONNECTED     148340   unix  2      [ ]         DGRAM                    6472     unix  3      [ ]         STREAM     CONNECTED     8347     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     7249     @/tmp/.X11-unix/X0unix  2      [ ]         DGRAM                    1405     unix  3      [ ]         STREAM     CONNECTED     148400   /var/run/dbus/system_bus_socketunix  3      [ ]         STREAM     CONNECTED     760169   unix  3      [ ]         STREAM     CONNECTED     12021    unix  3      [ ]         STREAM     CONNECTED     148525   unix  3      [ ]         STREAM     CONNECTED     10490    unix  3      [ ]         STREAM     CONNECTED     6979     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8111     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     148165   @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8158     unix  3      [ ]         STREAM     CONNECTED     7716     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8152     unix  3      [ ]         STREAM     CONNECTED     8165     unix  3      [ ]         STREAM     CONNECTED     148262   @/tmp/dbus-wqlXsXtyQPunix  3      [ ]         STREAM     CONNECTED     148176   unix  2      [ ]         DGRAM                    9352     unix  3      [ ]         DGRAM                    2468     unix  3      [ ]         STREAM     CONNECTED     148385   unix  3      [ ]         STREAM     CONNECTED     8346     unix  3      [ ]         STREAM     CONNECTED     12020    unix  3      [ ]         STREAM     CONNECTED     7248     unix  3      [ ]         STREAM     CONNECTED     148396   @/tmp/dbus-wqlXsXtyQPunix  3      [ ]         STREAM     CONNECTED     6951     unix  3      [ ]         STREAM     CONNECTED     8110     unix  3      [ ]         STREAM     CONNECTED     148164   unix  3      [ ]         STREAM     CONNECTED     7663     unix  3      [ ]         STREAM     CONNECTED     8159     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8166     @/tmp/dbus-wqlXsXtyQPunix  3      [ ]         STREAM     CONNECTED     148261   unix  3      [ ]         STREAM     CONNECTED     8491     @/tmp/.X11-unix/X0unix  3      [ ]         DGRAM                    2467     unix  3      [ ]         STREAM     CONNECTED     148386   @/tmp/dbus-wqlXsXtyQPunix  3      [ ]         STREAM     CONNECTED     7262     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8306     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     6976     /var/run/dbus/system_bus_socketunix  3      [ ]         STREAM     CONNECTED     148395   unix  3      [ ]         STREAM     CONNECTED     6753     unix  3      [ ]         STREAM     CONNECTED     6754     unix  3      [ ]         STREAM     CONNECTED     8190     unix  3      [ ]         STREAM     CONNECTED     8083     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8305     unix  3      [ ]         STREAM     CONNECTED     8162     unix  3      [ ]         STREAM     CONNECTED     7510     @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     8490     unix  3      [ ]         STREAM     CONNECTED     7261     unix  3      [ ]         STREAM     CONNECTED     148341   @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     148399   unix  3      [ ]         STREAM     CONNECTED     6975     unix  3      [ ]         STREAM     CONNECTED     760170   @/tmp/.X11-unix/X0unix  3      [ ]         STREAM     CONNECTED     148526   @/tmp/dbus-wqlXsXtyQPunix  3      [ ]         STREAM     CONNECTED     10491    @/tmp/.X11-unix/X0
there are no tcp or udp connections (they must have timed out)
6 datagram Unix sockets
62 connected stream Unix sockets

No hint to me of what could be stopping ethernet, certainly not too many connections from me.

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