Sun, Jan 21, 2018 10:56 pm
free and open-source software that provides
Virtual Private Network (VPN) connectivity that is available for a variety
operating systems. To use the software on a
Microsoft Windows 10 system, download the the installer for
Vista and later from the OpenVPN
Community Downloads page; get the OpenVPN community software not the
PrivateTunnel software from the OpenVPN project - I mistakenly downloaded
and installed PrivateTunnel when I first went to the
OpenVPN site and then had to
[ More Info ]
Mon, Jan 15, 2018 7:37 pm
Using the Windows Resource Monitor to monitor network activity
If you want to see the IP addresses to which a program on a Microsoft Windows
system is establishing connections, you can use the
Resource Monitor utility that is provided with
Vista and later versions of Windows to check on network connections from
a particular application on the system. To start the program, you can click
on the Windows
Start button and type
in the "Search programs and files" field on a Windows 7 system or the
"Type here to search" field on a Windows 10 system. You should see the
resmon utility returned as the best match.
When the Resource Monitor program is running, you can click on the
Network tab and then TCP Connections to see network activity
associated with programs currently running on the system . You can click on a
column header, e.g. "Image" to sort the entries by the values in that column.
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Sat, Jan 21, 2017 11:33 pm
Error occurred message when upgrading freeSSHd
I needed to upgrade freeSSHd
Secure Shell (SSH)
server software for Microsoft Windows systems, on a
Windows 8 system. The software allows remote users to log into a command line
interface on the Windows system via SSH and provides the capability to transfer
files via the SSH File Transfer Protocol (SFTP)
. When I attempted to
install the latest version of the software over a prior version, however, the
installation was unsuccessful. If you see the following error message, you may
need to stop the SSHD service prior to performing the upgrade:
An error occurred while trying to replace the existing file:
DeleteFile failed; code 5.
Access is denied.
Click Retry to try again, Ignore to skip this file (not recommended), or
Abort to cancel installation.
[ More Info ]
Sat, Mar 19, 2016 10:51 pm
Determining which program is listening on a port under Windows
If you want to know which application is listening on a particular
network port on a Microsoft Windows system, e.g., port 80, the port used
for HTTP connections to a web server, you can obtain that information
from a command line interface (CLI) by
obtaining a command prompt
using the netstat and tasklist commands which are provided with the
operating system; you do not need to install any additional software,
though there are programs that will allow you to view that information
from a graphical user interface (GUI).
[ More Info ]
Mon, Feb 29, 2016 11:07 pm
Using SSH Keys with PuTTY
free and open source
network utility that allows you to establish
connections to servers. It is commonly used on Microsoft
Windows systms, but is also available for
Apple OS X
systems. You can use it for interactive SSH logins where you provide a
userid and password to authenticate with an SSH server, but you can also use
it for public key
-based logins where the server has a public key
that is matched against a private key stored on the system from which you
are connecting. By a mathematical calculation based on large
, the public key and private key can be matched with one another
as a means of authenticating the login.
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Sun, Feb 14, 2016 1:40 pm
Determining if a Windows system supports the 5 GHz Wifi band
network adapter in a Microsoft Windows system may support
wireless connections, i.e, both the 2.4 GHz and 5 GHz bands for a
wireless local area network (WLAN)
, or it may only only support the older
2.4 GHz standard. A
band is is a group of frequencies containing many channels.
To determine if a wireless adapter can support both the 2.4 and 5 GhZ Wifi
standards, you can obtain a command
and type the command
netsh wlan show drivers
you see 802.11a listed on the "Radio types supported line, then the adapter
supports the 5 GHz as well as the 2.4 GHz bands.
[ More Info ]
Sun, Feb 07, 2016 8:04 pm
Changing the appearance of a PuTTY session
If you wish to be able to easily distinguish
Secure Shell (SSH)
sessions to a particular
server when using PuTTY
free and open-source
client application available for Microsoft Windows, OS X, and Linux
systems, you can change the background color used for connections
to a particular server through PuTTY's "Change Settings" option,
which will allow you to change the background and foreground colors
(the foreground color is used for text). Colors are specified by
[ More Info ]
Fri, Jun 12, 2015 10:12 pm
Port forwarding with PuTTY
The free PuTTY
program for Microsoft Windows systems allows you to establish SSH connections.
The program includes
capability, so that you can forward connectivity to
a port on the system running PuTTY to a port on the SSH server to which you
have connected using PuTTY or even another system accessible from the SSH
server. E.g., suppose you can remotely connect to a SSH server at your
home or business, but you can't access a web server at home or at the business
location remotely. One option you can use is have PuTTY "listen" on the system
on which it runs on a port, e.g., port 8888, and for any connection to that
port on the local system on which PuTTY is running, forward the connection
to the remote web server through the SSH server as explained at
to another device with PuTTY
. Such port forwarding can be performed
to any TCP port.
Alternatively, you can set up a
SOCKS proxy using PuTTY as noted at
Using PuTTY to set up a SOCKS Proxy
Connection. Instructions for configuring some browsers ito use a
SOCKS proxy are provided from the links below:
Wed, Feb 25, 2015 11:22 pm
Where PuTTY Stores SSH port forwarding information
You can configure
, a free telnet/SSH client program, to port forward connections over
an SSH connection by going to "SSH" then "Tunnels" when configuring a session.
Once you've added instances of port forwarding you can't edit those
instances through the PuTTY configuration window though you can remove them and
add new ones. The information for port forwarding is stored in the registry
under the following key where Session_Name is the name for a stored
Updates are stored when you save a session.
E.g., if I saved a session with the name Omega using the tunneling
configuration shown above, the registry entry at
for a dynamic SOCKS proxy at port 1080 and forwarding for RDP using local
port 30,089 forwarded to port 3389 on a system with IP address 192.168.0.5
would be as follows:
I could change the details for the port forwardings by editing the
registry entry. I would see the changed values when I loaded the session.
I could check the information from a command prompt with the following command:
C:\>reg query "HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions\Omega" /v PortForwardings
PortForwardings REG_SZ D1080=,L30089=192.168.0.5:3389
Sun, Dec 14, 2014 5:45 pm
Copssh Connection Issues
When I tried connecting to a Windows 7 Professional system running Copssh 5.0.1 from PuTTY
0.58 on a Windows Small Business Server (SBS) 2003 system, a "PuTTY Fatal Error"
window appeared with the message "Couldn't agree a client-to-server cipher
I tried connecting from the same system with an OpenSSH_3.8.1p1 SSH client
that is part of OpenSSH for
and received the message "no kex alg", which may mean "no
key-exchange algorithm". When I tried specifying the encryption cipher using
the OpenSSH client, I received an error message similar to the one I saw
C:\Program Files\SSH\OpenSSH\bin>ssh -c 3des firstname.lastname@example.org
no matching cipher found: client 3des-cbc server aes128-ctr,aes192-ctr,aes256-ctr,email@example.com,firstname.lastname@example.org,email@example.com
C:\Program Files\SSH\OpenSSH\bin>ssh -c blowfish firstname.lastname@example.org
no matching cipher found: client blowfish-cbc server aes128-ctr,aes192-ctr,aes256-ctr,email@example.com,firstname.lastname@example.org,email@example.com
When I tried connecting from the SBS 2003 system to another system, to
which I could successfully connect with the OpenSSH SSH client, when I
-v option for debugging output with
firstname.lastname@example.org, I saw the following:
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.4
debug1: match: OpenSSH_6.4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
I upgraded PuTTY on the client system from version 0.58 to 0.63. I then no
longer received the message about no matching cipher being found, but, instead
saw another "PuTTY Fatal Error" window open, this time with the message
"Network error: Software caused connection abort". I saw the same error
message when I used PuTTY's
plink utility from the command line.
C:\Program Files\Network\SSH\PuTTY>plink -ssh email@example.com
Using username "jdoe".
FATAL ERROR: Network error: Software caused connection abort
I installed Bitvise
SSH Client (Tunnelier) 6.08 and tried connecting with
that client. Like with PuTTY, after I authenticated with the SSH server, I
was immediately disconnected. I saw the following from Tunnelier:
First key exchange completed using ecdh-sha2/nistp521. Session encryption:
aes256-ctr, MAC: hmac-sha2-256, compression: none.
Attempting password authentication.
The SSH2 session has terminated with error. Reason: FlowSocketReader: Error
receiving bytes. Windows error 10054: An existing connection was forcibly closed
by the remote host.
When I was able later to connect to the system running Copssh via
troubleshooting after the user had left for the day, I
checked its status log, which you can do on a Windows 7 system by the following
- Click on Start.
- Select All Programs.
- Select Copssh.
- Select Copssh Control Panel.
- Under the Status tab, you will see
an icon that looks like a piece of paper with one edge folded down. You
may also see something like "6 events last 15 minutes" next to it.
Double-click on that icon.
When I checked the log, I saw many "fatal: mm_request_receive: read: Connection reset by peer" messages. There was a "Received SIGHUP; restarting" entry
2014.12.12 23:26:23 - Received SIGHUP; restarting.
2014.12.12 18:30:02 - fatal: mm_request_receive: read: Connection reset by peer
Seeing that, I tried establishing a connection with PuTTY again
and was then able to log in by SSH successfully.
But then when I tried logging in remotely by SSH two days later the problem
was back. I restarted the service within the Copssh Control Panel by clicking
on the green button next to "Service is running" to stop the service. When
the button turned red, I clicked on it again to restart the service, but that
didn't resolve the problem; I still got the "Network error: Software
caused connection abort" message when I tried connecting via PuTTY 0.63 and
I saw the "fatal: mm_request_receive: read: Connection reset by peer" message
in the Copssh log for evey connection attempt. Though I didn't expect it
to resolve the problem, I tried the "net stop" and "net start" commands from
a command prompt.
C:\Users\Administrator>net stop "OpenSSH SSHD"
The Openssh SSHD service is stopping.
The Openssh SSHD service was stopped successfully.
C:\Users\Administrator>net start "OpenSSH SSHD"
The Openssh SSHD service is starting.
The Openssh SSHD service was started successfully.
But that did work. I was then able to successfully log into the system
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