//[ConnectBot SSH Library](../../../../index.md)/[org.connectbot.sshlib](../../index.md)/[SshClientConfig](../index.md)/[Builder](index.md) # Builder [jvm]\ class [Builder](index.md) ## Constructors | | | |---|---| | [Builder](-builder.md) | [jvm]
constructor() | ## Properties | Name | Summary | |---|---| | [autoDisconnectOnLastChannelClose](auto-disconnect-on-last-channel-close.md) | [jvm]
var [autoDisconnectOnLastChannelClose](auto-disconnect-on-last-channel-close.md): [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)
Whether to automatically disconnect the SSH connection when the last channel is closed. | | [clientVersion](client-version.md) | [jvm]
var [clientVersion](client-version.md): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)
Client version string sent during SSH handshake. | | [enableCompression](enable-compression.md) | [jvm]
var [enableCompression](enable-compression.md): [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)
Enable zlib compression. When true, the client offers `zlib@openssh.com,zlib,none`; when false, only `none`. | | [encryptionAlgorithms](encryption-algorithms.md) | [jvm]
var [encryptionAlgorithms](encryption-algorithms.md): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html) | | [environment](environment.md) | [jvm]
var [environment](environment.md): [Map](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.collections/-map/index.html)<[String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html), [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)>
Environment variables sent before each session starts, including SFTP. Servers may ignore variables not allowed by their policy (OpenSSH AcceptEnv). Names and values use UTF-8 and must not contain NUL. Only supplied variables are sent. | | [host](host.md) | [jvm]
var [host](host.md): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)
Hostname for TCP connections. Used with default KtorTcpTransport. Ignored if [transportFactory](transport-factory.md) is set explicitly. | | [hostKeyAlgorithms](host-key-algorithms.md) | [jvm]
var [hostKeyAlgorithms](host-key-algorithms.md): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html) | | [hostKeyVerifier](host-key-verifier.md) | [jvm]
var [hostKeyVerifier](host-key-verifier.md): [HostKeyVerifier](../../-host-key-verifier/index.md)?
Host key verifier. | | [ipVersion](ip-version.md) | [jvm]
var [ipVersion](ip-version.md): [IpVersion](../../../org.connectbot.sshlib.transport/-ip-version/index.md)
IP version preference for the default TCP transport. Ignored if [transportFactory](transport-factory.md) is set explicitly. | | [keepAliveIntervalMs](keep-alive-interval-ms.md) | [jvm]
var [keepAliveIntervalMs](keep-alive-interval-ms.md): [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)
Send an SSH_MSG_IGNORE heartbeat every N milliseconds to keep the connection alive across NAT/VPN/firewall idle timeouts. | | [kexAlgorithms](kex-algorithms.md) | [jvm]
var [kexAlgorithms](kex-algorithms.md): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html) | | [macAlgorithms](mac-algorithms.md) | [jvm]
var [macAlgorithms](mac-algorithms.md): [String](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html) | | [obscureKeystrokeTimingIntervalMs](obscure-keystroke-timing-interval-ms.md) | [jvm]
var [obscureKeystrokeTimingIntervalMs](obscure-keystroke-timing-interval-ms.md): [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)
Quantize outbound keystroke packet timing to this interval (milliseconds) to mask inter-keystroke timing patterns. Requires a PTY session and server support for `ping@openssh.com`. Set to 0 to disable. | | [port](port.md) | [jvm]
var [port](port.md): [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)
Port for TCP connections. Used with default KtorTcpTransport. Ignored if [transportFactory](transport-factory.md) is set explicitly. | | [preferPasswordAuth](prefer-password-auth.md) | [jvm]
var [preferPasswordAuth](prefer-password-auth.md): [Boolean](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)
When true, prefer `password` over `keyboard-interactive` when both are available. By default, `keyboard-interactive` is preferred. | | [rekeyBytesLimit](rekey-bytes-limit.md) | [jvm]
var [rekeyBytesLimit](rekey-bytes-limit.md): [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)
Re-key after this many wire bytes (sent or received). Default: 1 GB. | | [rekeyIntervalMs](rekey-interval-ms.md) | [jvm]
var [rekeyIntervalMs](rekey-interval-ms.md): [Long](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-long/index.html)
Re-key after this many milliseconds. Default: 1 hour. | | [sessionWindowSize](session-window-size.md) | [jvm]
var [sessionWindowSize](session-window-size.md): [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)
Receive window, in bytes, for shells, commands and manually opened subsystems. SFTP channels opened by [SshClient.openSftp](../../-ssh-client/open-sftp.md) use [sftpWindowSize](sftp-window-size.md). A channel moves at most one window of data per network round trip, so a larger window speeds up bulk transfers on slower links. Each channel may buffer up to this much unread data. Default: 2 MiB. Reduce this for sessions with tighter memory limits. | | [sftpWindowSize](sftp-window-size.md) | [jvm]
var [sftpWindowSize](sftp-window-size.md): [Int](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)
Receive window, in bytes, for channels opened by [SshClient.openSftp](../../-ssh-client/open-sftp.md). Default: 8 MiB, to sustain bulk downloads on higher-latency links. Each channel may buffer up to this much unread data; reduce this for tighter memory limits. | | [transportFactory](transport-factory.md) | [jvm]
var [transportFactory](transport-factory.md): [TransportFactory](../../../org.connectbot.sshlib.transport/-transport-factory/index.md)?
Custom transport factory. If not set, uses [KtorTcpTransportFactory](../../../org.connectbot.sshlib.transport/-ktor-tcp-transport-factory/index.md) with [host](host.md), [port](port.md), and [ipVersion](ip-version.md). | ## Functions | Name | Summary | |---|---| | [build](build.md) | [jvm]
fun [build](build.md)(): [SshClientConfig](../index.md) |