Enter-PSSession

Allows redirection of this connection to an alternate Uniform Resource Identifier (URI). By default, redirection is not allowed.

When you use the ConnectionURI parameter, the remote destination can return an instruction to redirect to a different URI. By default, PowerShell does not redirect connections, but you can use this parameter to allow it to redirect the connection.

You can also limit the number of times the connection is redirected by changing the MaximumConnectionRedirectionCount session option value. Use the MaximumRedirection parameter of the New-PSSessionOption cmdlet or set the MaximumConnectionRedirectionCount property of the $PSSessionOption preference variable. The default value is 5.

Specifies the application name segment of the connection URI. Use this parameter to specify the application name when you are not using the ConnectionURI parameter in the command.

The default value is the value of the $PSSessionApplicationName preference variable on the local computer. If this preference variable is not defined, the default value is WSMAN. This value is appropriate for most uses. For more information, see about_Preference_Variables.

The WinRM service uses the application name to select a listener to service the connection request. The value of this parameter should match the value of the URLPrefix property of a listener on the remote computer.

Specifies the mechanism that is used to authenticate the user's credentials. The acceptable values for this parameter are:

• Default
• Basic
• Credssp
• Digest
• Kerberos
• Negotiate
• NegotiateWithImplicitCredential

The default value is Default.

CredSSP authentication is available only in Windows Vista, Windows Server 2008, and later versions of the Windows operating system.

For more information about the values of this parameter, see AuthenticationMechanism Enum.

Caution: Credential Security Support Provider (CredSSP) authentication, in which the user's credentials are passed to a remote computer to be authenticated, is designed for commands that require authentication on more than one resource, such as accessing a remote network share. This mechanism increases the security risk of the remote operation. If the remote computer is compromised, the credentials that are passed to it can be used to control the network session.

Specifies the digital public key certificate (X509) of a user account that has permission to perform this action. Enter the certificate thumbprint of the certificate.

Certificates are used in client certificate-based authentication. They can be mapped only to local user accounts; they do not work with domain accounts.

To get a certificate, use the Get-Item or Get-ChildItem command in the PowerShell Cert: drive.

Specifies a computer name. This cmdlet starts an interactive session with the specified remote computer. Enter only one computer name. The default is the local computer.

Type the NetBIOS name, the IP address, or the fully qualified domain name of the computer. You can also pipe a computer name to Enter-PSSession.

To use an IP address in the value of the ComputerName parameter, the command must include the Credential parameter. Also, the computer must be configured for HTTPS transport or the IP address of the remote computer must be included in the WinRM TrustedHosts list on the local computer. For instructions for adding a computer name to the TrustedHosts list, see "How to Add a Computer to the Trusted Host List" in about_Remote_Troubleshooting.

Note: In Windows Vista and later versions of the Windows operating system, to include the local computer in the value of the ComputerName parameter, you must start PowerShell with the Run as administrator option.

Specifies the session configuration that is used for the interactive session.

Enter a configuration name or the fully qualified resource URI for a session configuration. If you specify only the configuration name, the following schema URI is prepended: http://schemas.microsoft.com/powershell.

When used with SSH, this specifies the subsystem to use on the target as defined in sshd_config. The default value for SSH is the powershell subsystem.

The session configuration for a session is located on the remote computer. If the specified session configuration does not exist on the remote computer, the command fails.

The default value is the value of the $PSSessionConfigurationName preference variable on the local computer. If this preference variable is not set, the default is Microsoft.PowerShell. For more information, see about_Preference_Variables.

Specifies a URI that defines the connection endpoint for the session. The URI must be fully qualified. The format of this string is as follows:

<Transport>://<ComputerName>:<Port>/<ApplicationName>

The default value is as follows:

http://localhost:5985/WSMAN

If you do not specify a ConnectionURI, you can use the UseSSL, ComputerName, Port, and ApplicationName parameters to specify the ConnectionURI values.

Valid values for the Transport segment of the URI are HTTP and HTTPS. If you specify a connection URI with a Transport segment, but do not specify a port, the session is created by using standards ports: 80 for HTTP and 443 for HTTPS. To use the default ports for PowerShell remoting, specify port 5985 for HTTP or 5986 for HTTPS.

If the destination computer redirects the connection to a different URI, PowerShell prevents the redirection unless you use the AllowRedirection parameter in the command.

Specifies the ID of a container.

Specifies a user account that has permission to perform this action. The default is the current user.

Type a user name, such as User01 or Domain01\User01, or enter a PSCredential object generated by the Get-Credential cmdlet. If you type a user name, you're prompted to enter the password.

Credentials are stored in a PSCredential object and the password is stored as a SecureString.

Indicates that this cmdlet adds an interactive security token to loopback sessions. The interactive token lets you run commands in the loopback session that get data from other computers. For example, you can run a command in the session that copies XML files from a remote computer to the local computer.

A loopback session is a PSSession that originates and ends on the same computer. To create a loopback session, omit the ComputerName parameter or set its value to . (dot), localhost, or the name of the local computer.

By default, loopback sessions are created by using a network token, which might not provide sufficient permission to authenticate to remote computers.

The EnableNetworkAccess parameter is effective only in loopback sessions. If you use EnableNetworkAccess when you create a session on a remote computer, the command succeeds, but the parameter is ignored.

You can also allow remote access in a loopback session by using the CredSSP value of the Authentication parameter, which delegates the session credentials to other computers.

This parameter was introduced in Windows PowerShell 3.0.

Specifies a computer name for a Secure Shell (SSH) based connection. This is similar to the ComputerName parameter except that the connection to the remote computer is made using SSH rather than Windows WinRM. This parameter supports specifying the user name and/or port as part of the host name parameter value using the form user@hostname:port. The user name and/or port specified as part of the host name takes precedence over the -UserName and -Port parameters, if specified. This allows passing multiple computer names to this parameter where some have specific user names and/or ports, while others use the user name and/or port from the -UserName and -Port parameters.

This parameter was introduced in PowerShell 6.0.

Specifies the ID of an existing session. Enter-PSSession uses the specified session for the interactive session.

To find the ID of a session, use the Get-PSSession cmdlet.

Specifies the instance ID of an existing session. Enter-PSSession uses the specified session for the interactive session.

The instance ID is a GUID. To find the instance ID of a session, use the Get-PSSession cmdlet. You can also use the Session, Name, or ID parameters to specify an existing session. Or, you can use the ComputerName parameter to start a temporary session.

Specifies a key file path used by Secure Shell (SSH) to authenticate a user on a remote computer.

SSH allows user authentication to be performed via private/public keys as an alternative to basic password authentication. If the remote computer is configured for key authentication then this parameter can be used to provide the key that identifies the user.

This parameter was introduced in PowerShell 6.0.

Specifies the friendly name of an existing session. Enter-PSSession uses the specified session for the interactive session.

If the name that you specify matches more than one session, the command fails. You can also use the Session, InstanceID, or ID parameters to specify an existing session. Or, you can use the ComputerName parameter to start a temporary session.

To establish a friendly name for a session, use the Name parameter of the New-PSSession cmdlet.

Specifies the network port on the remote computer that is used for this command.

In PowerShell 6.0 this parameter was inlcuded in the HostName parameter set which supports Secure Shell (SSH) connections.

WinRM (ComputerName parameter set)

To connect to a remote computer, the remote computer must be listening on the port that the connection uses. The default ports are 5985, which is the WinRM port for HTTP, and 5986, which is the WinRM port for HTTPS.

Before using an alternate port, you must configure the WinRM listener on the remote computer to listen at that port. Use the following commands to configure the listener:

1. winrm delete winrm/config/listener?Address=*+Transport=HTTP
2. winrm create winrm/config/listener?Address=*+Transport=HTTP @{Port="\<port-number\>"}

Do not use the Port parameter unless you must. The port setting in the command applies to all computers or sessions on which the command runs. An alternate port setting might prevent the command from running on all computers.

SSH (HostName parameter set)

To connect to a remote computer, the remote computer must be configured with the SSH service (SSHD) and must be listening on the port that the connection uses. The default port for SSH is 22.

Indicates that the PSSession runs as administrator.

Specifies a PowerShell session (PSSession) to use for the interactive session. This parameter takes a session object. You can also use the Name, InstanceID, or ID parameters to specify a PSSession.

Enter a variable that contains a session object or a command that creates or gets a session object, such as a New-PSSession or Get-PSSession command. You can also pipe a session object to Enter-PSSession. You can submit only one PSSession by using this parameter. If you enter a variable that contains more than one PSSession, the command fails.

When you use Exit-PSSession or the EXIT keyword, the interactive session ends, but the PSSession that you created remains open and available for use.

Sets advanced options for the session. Enter a SessionOption object, such as one that you create by using the New-PSSessionOption cmdlet, or a hash table in which the keys are session option names and the values are session option values.

The default values for the options are determined by the value of the $PSSessionOption preference variable, if it is set. Otherwise, the default values are established by options set in the session configuration.

The session option values take precedence over default values for sessions set in the $PSSessionOption preference variable and in the session configuration. However, they do not take precedence over maximum values, quotas or limits set in the session configuration.

For a description of the session options, including the default values, see New-PSSessionOption. For information about the $PSSessionOption preference variable, see about_Preference_Variables. For more information about session configurations, see about_Session_Configurations.

Indicates that the remote connection is established using Secure Shell (SSH).

By default PowerShell uses Windows WinRM to connect to a remote computer. This switch forces PowerShell to use the HostName parameter set for establishing an SSH based remote connection.

This parameter was introduced in PowerShell 6.0.

Specifies the SSH subsystem used for the new PSSession.

This specifies the subsystem to use on the target as defined in sshd_config. The subsystem starts a specific version of PowerShell with predefined parameters. If the specified subsystem does not exist on the remote computer, the command fails.

If this parameter is not used, the default is the 'powershell' subsystem.

Specifies the user name for the account used to create a session on the remote computer. User authentication method will depend on how Secure Shell (SSH) is configured on the remote computer.

If SSH is configured for basic password authentication then you will be prompted for the user password.

If SSH is configured for key based user authentication then a key file path can be provided via the KeyFilePath parameter and no password prompt will occur. Note that if the client user key file is located in an SSH known location then the KeyFilePath parameter is not needed for key based authentication, and user authentication will occur automatically based on the user name. See SSH documentation about key based user authentication for more information.

This is not a required parameter. If no UserName parameter is specified then the current log on user name is used for the connection.

This parameter was introduced in PowerShell 6.0.

Indicates that this cmdlet uses the Secure Sockets Layer (SSL) protocol to establish a connection to the remote computer. By default, SSL is not used.

WS-Management encrypts all PowerShell content transmitted over the network. The UseSSL parameter is an additional protection that sends the data across an HTTPS connection instead of an HTTP connection.

If you use this parameter, but SSL is not available on the port that is used for the command, the command fails.

Specifies the ID of a virtual machine.

Specifies the name of a virtual machine.