Posted by jpluimers on 2016/08/09
Wonder if I can get this to work from macOS / OS X as a client:
texttop – A fully interactive X Linux desktop rendered in TTY and streamable over SSH
Source: tombh/texttop: A fully interactive X Linux desktop rendered in TTY and streamable over SSH
via: Kristian Köhntopp – Google+
Posted in *nix, *nix-tools, Communications Development, Development, Internet protocol suite, Linux, Power User, Software Development, SSH, TCP | Leave a Comment »
Posted by jpluimers on 2016/08/08
Attack from the ’90s resurfaces more deadly than before
Source: Windows Flaw Reveals Microsoft Account Passwords, VPN Credentials
TL;DR: block LAN->WAN port 445
Note this won’t affect web-dav shares like \live.sysinternals.com\DavWWWRoot as that uses ports 443 and 80.
–jeroen
via:
Posted in Communications Development, Development, https, Internet protocol suite, Microsoft Surface on Windows 7, NTLM, Power User, Security, SMB, TCP, WebDAV, Windows, Windows 10, Windows 7, Windows 8, Windows 8.1, Windows 9, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Vista, Windows XP | Leave a Comment »
Posted by jpluimers on 2016/06/21
I’m using these Chrome Extensions for most of the http / https call mockups, and after that put them in SoapUI (which despite the name also does REST and has come a long way sinceSource: SoupUI – as sometimes that is the only thing that works):
You can get both Postman versions through GetPostman.com as well.
–jeroen
Posted in .NET, .NET 2.0, .NET 3.0, .NET 3.5, .NET 4.0, .NET 4.5, ASP.NET, C#, C# 3.0, C# 4.0, C# 5.0, Chrome, Communications Development, Development, Google, HTTP, Internet protocol suite, Power User, REST, Software Development, TCP | 1 Comment »
Posted by jpluimers on 2016/05/03
After a recent big update to OpenSuSE Tumbleweed, I could not ssh into my system any more.
The ssh client side would report a Read from socket failed: Connection reset by peer which I misinterpreted as the sshd not running at all.
Luckily the server is a VM, so I could reach the console. There I saw this:
sshd trying to load files it shouldn’t
The files should not be loaded as they are not specified in the sshd_config file:
dsa and ecdsa not specified in the config file
So I knew something was broken. After reading some messages in the forums.opensuse.org I got at Bug 977812 – sshd killed by SIGSYS on client connection
As usual with such issues the cause seems a combination of factors:
And we have the culprit, I believe: together with the glibc upgrade, openssl
was updated from 1.0.2g-1.1 to 1.0.2-2.12 which brought, among others, patch
openssl-urandom-reseeding.patch.
A temporary fix is to comment out a line in /etc/sshd_config so you get this diff:
-UsePrivilegeSeparation sandbox # Default for new installations.
+# UsePrivilegeSeparation sandbox # Default for new installations.
Be sure to undo this as soon as you’ve received a final fix.
A final fix is being fast-tracked so it appears in Tumbleweed soon.
I will report after deployment of [opensuse-factory] New Tumbleweed snapshot 20160502 released! as I think it contains the fix.
I already knew about openQA: Test summary which lists the builds, but not the changes in the builds.
Reading through Information Board or the like for Tumbleweed I found the openSUSE Mailinglist Archive: opensuse-factory which does the announcements and release notes for Tumbleweed.
It had both the announcement of the “big patch”, ssh bug report and temporary fix:
–jeroen
Posted in *nix, Communications Development, Development, Internet protocol suite, Linux, openSuSE, Power User, SSH, SuSE Linux, TCP, Tumbleweed | 2 Comments »
Posted by jpluimers on 2016/03/07
Last friday I updated the examples at *nix networking – lsof: How to tell what process has a specific port open on Linux (via: Server Fault) as I needed to document some of the machines around here (so it becomes easier replacing them).
I also added some links to background information and (when I get to using it: OS X still goes without) a good iproute2 starter page.
–jeroen
Posted in *nix, *nix-tools, Apple, Communications Development, Cygwin, Development, Internet protocol suite, Linux, Mac, Mac OS X / OS X / MacOS, Mac OS X 10.6 Snow Leopard, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, OS X 10.10 Yosemite, OS X 10.8 Mountain Lion, OS X 10.9 Mavericks, Power User, TCP | Leave a Comment »
Posted by jpluimers on 2016/01/14
Through [WayBack] netcat 1.11 for Win32/Win64 I bumped into [WayBack] Netcat – Wikipedia, the free encyclopedia.
The docs at [WayBack] Netcat: the TCP/IP swiss army made it arrive on my research list.
Time for some scripting with it (:
–jeroen
via:
Posted in Communications Development, Development, Internet protocol suite, TCP | Leave a Comment »
Posted by jpluimers on 2015/12/25
Nice explanation of unicast, multicast, RTP and much more:
Computer network technologies and services/VoIP – Wikibooks, open books for an open world.
–jeroen
Posted in Communications Development, Development, Internet protocol suite, TCP | Leave a Comment »
Posted by jpluimers on 2015/12/22
Hopefully someone will move this to Github before Google code goes down: paping – Cross-platform TCP port testing, emulating the functionality of ping (port ping) – Google Project Hosting.
Paping (pronounced pah ping) is a computer network administration utility used to test the reachability of a host on an Internet Protocol (TCP/IP) network and to measure the time it takes to connect to a specified port
–jeroen
via:
Posted in *nix, *nix-tools, Communications Development, Console (command prompt window), Development, Internet protocol suite, Power User, TCP, Windows | 1 Comment »
Posted by jpluimers on 2015/10/28
Tibco is very powerful and can do all sorts of casting.
For my memory (formatted for readability; there are more details at OpenPGM Concepts : Transport):
The network parameter consists of up to three parts, separated by semicolons—network, multicast groups, send address—as in these examples:
Example Meaning lan0 network only lan0;225.1.1.1 one multicast group lan0;225.1.1.1,225.1.1.5;225.1.1.6 two multicast groups, send address lan0;;225.1.1.6 no multicast group, send address The format is like this:
partOne;partTwo;partThreeand some bits are optional
partOne[;[partTwo][;[partThree]]]Part one identifies the network, which you can specify in several ways: – Host name, Host IP address, Network name, Network IP number, Interface name, Default TRDP daemons use the network interface which corresponds to the hostname of the system as determined by the C function gethostname(). PGM daemons use the default PGM multicast interface, 224.0.1.78.
Part Two—Multicast Groups – Part two is a list of zero or more multicast groups to join, specified as IP addresses, separated by commas. Each address in part two must denote a valid multicast address. Joining a multicast group enables listeners on the resulting transport to receive data sent to that multicast group.
Part Three—Send Address, Part three is a single send address. When a program sends multicast data on the resulting transport, it is sent to this address. (Point-to-point data is not affected.) If present, this item must be an IP address—not a host name or network name. The send address need not be among the list of multicast groups joined in part two. If you join one or more multicast groups in part two, but do not specify a send address in part three, the send address defaults to the first multicast group listed in part two.
Note: I wasn’t aware that for Tibco Rendezvous the default multi-cast network was 225 (often you see 224 here, as that is the starting multi-cast range in the IANA IPv4 Address Space list)
–jeroen
via:
Posted in Communications Development, Development, Internet protocol suite, Network-and-equipment, Software Development, TCP, TIBCO Rendezvous | Leave a Comment »
Posted by jpluimers on 2015/10/16
Interesting: this works through an on-line service that monitors up to 2 servers for free (including protocols like HTTP, SMTP and PING).
You can get reports at either through:
I’m using this to monitor my boxes at home.
A demo video is below.
–jeroen
Posted in *nix, Communications Development, Development, HTTP, Internet protocol suite, Power User, SMTP, TCP | Leave a Comment »
The Wiert Corner - irregular stream of stuff 