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Sun, Jan 21, 2018 10:56 pm

OpenVPN

OpenVPN is free and open-source software that provides Virtual Private Network (VPN) connectivity that is available for a variety of operating systems. To use the software on a Microsoft Windows 10 system, download the the installer for Windows 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 uninstall PrivateTunnel.

[ More Info ]

[/os/windows/network/vpn] permanent link

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 Windows 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 resmon or resmon.exe 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.

[ More Info ]

[/os/windows/network/monitoring/resmon] permanent link

Sat, Jan 21, 2017 11:33 pm

Error occurred message when upgrading freeSSHd

I needed to upgrade freeSSHd, which is free 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 ]

[/os/windows/network/ssh/freeSSHd] permanent link

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 and 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 ]

[/os/windows/network] permanent link

Mon, Feb 29, 2016 11:07 pm

Using SSH Keys with PuTTY

PuTTY is a free and open source network utility that allows you to establish Telnet and Secure Shell (SSH) connections to servers. It is commonly used on Microsoft Windows systms, but is also available for Linux and 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 prime numbers, the public key and private key can be matched with one another as a means of authenticating the login.

[ More Info ]

[/os/windows/network/ssh/putty] permanent link

Sun, Feb 14, 2016 1:40 pm

Determining if a Windows system supports the 5 GHz Wifi band

The Wi-Fi network adapter in a Microsoft Windows system may support dual band 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 radio frequency (RF) 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 prompt and type the command netsh wlan show drivers. If 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 ]

[/os/windows/network] permanent link

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, a free and open-source SSH and Telnet 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 RGB value.

[ More Info ]

[/os/windows/network/ssh/putty] permanent link

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 port forwarding 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 Port forwarding 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:

[/os/windows/network/ssh/putty] permanent link

Wed, Feb 25, 2015 11:22 pm

Where PuTTY Stores SSH port forwarding information

You can configure PuTTY, a free telnet/SSH client program, to port forward connections over an SSH connection by going to "SSH" then "Tunnels" when configuring a session.

PuTTY Configuration - Port Forwarding

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 session:

HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions\Session_Name

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 HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions\Omega 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:

Value name:PortForwardings
Value data:D1080=,L30089=192.168.0.5:3389

Regedit - PuTTY Port Forwardings

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

HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions\Omega
    PortForwardings    REG_SZ    D1080=,L30089=192.168.0.5:3389

[/os/windows/network/ssh/putty] permanent link

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 (available: aes128ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com)". I tried connecting from the same system with an OpenSSH_3.8.1p1 SSH client that is part of OpenSSH for Windows 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 with PuTTY.
C:\Program Files\SSH\OpenSSH\bin>ssh -c 3des jdoe@192.168.0.15
no matching cipher found: client 3des-cbc server aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com
C:\Program Files\SSH\OpenSSH\bin>ssh -c blowfish jdoe@192.168.0.15
no matching cipher found: client blowfish-cbc server aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.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 specified the -v option for debugging output with ssh -v jdoe@example.com, 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 jdoe@192.168.0.15
Using username "jdoe".
jdoe@192.168.0.15's password:
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.
Authentication completed.
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 RDP for 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 steps:

  1. Click on Start.
  2. Select All Programs.
  3. Select Copssh.
  4. Select Copssh Control Panel.
  5. 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.

    Copssh Control Panel status tab

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 hours later.

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 via SSH.

[/os/windows/network/ssh/copssh] permanent link

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