SSH config file for Open. SSH client This page is about Open. SSH client configuration. For Open. SSH server configuration, see sshdconfig. For Tectia SSH configuration, see Tectia SSH Server Administrator Manual. For configuring passwordless public key authentication, see ssh keygen. The ssh program on a host receives its configuration from either the command line or from configuration files. Command line options take precedence over configuration files. The user specific configuration file. Finally, the global etcsshsshconfig file is used. The first obtained value for each configuration parameter will be used. Verify Configuration How to Find Config File Location. The active configuration file can be verified by inspecting RabbitMQ log file. Commonly used configuration options. There are many configuration options available. In practice, only a few of them are ever changed, and user specific configuration files are rarely used. In most cases, just etcsshsshconfig is edited. Enabling X1. 1 forwarding and agent forwarding. Developers, students, and researchers often want to enable X1. SSH agent forwarding. These allow running graphical applications remotely and eliminate the need for typing a password whenever moving from one server to another, respectively. Setting these options in etcsshsshconfig makes life easier for end users, saves overhead, and reduces support load. However, they increase the risk of an attack spreading from a compromised server to a users desktop, so the most security critical environments may want to leave them disabled. There is generally no reason to enable them on production servers in enterprises. Details for file extension CONFIG WatchDirectory. Troubleshoot, fix and learn about CONFIG and errors with extensive information from Filext. com. To change the sequence of performance counters in the log file is enough to change the order in app. config ltxml version1. 0 ltconfiguration. Forward. Agent yes. Port forwarding. Local and remote port forwarding can be used for tunneling applications, accessing intranet web services from home, tunneling database access, and many other purposes. For instructions on configuring port forwarding, see the port forwarding configuration page. Note, however, that port forwarding can also be used to tunnel traffic from the external Internet into a corporate intranet. Employees sometimes do this to be able to work from home even when company policy does not permit it. Hackers use it to leave permanent backdoor. See the page on SSH tunneling for more information. Configuring public key authentication. Public authentication is used for passwordless logins between systems. It is often used for automated processes, such as backups, configuration management, and file transfers. It is also used by sophisticated end users and system administrators for single sign on. See the public key authentication for configuring it. When a user has created more than one SSH key for authentication, the i command line option may be helpful for specifying which key to use. In the client configuration file, this can be specified using the Identity. File options. Certificate based authentication. Open. SSH certificates can be used for authentication either using ssh agent or by specifying the Certificate. File option in the client configuration file. See SSH certificates for more information. Format of SSH client config file sshconfig. The sshconfig client configuration file has the following format. Both the global etcsshsshconfig and per user sshconfig have the same format. Empty lines and lines starting with are comments. Each line begins with a keyword, followed by arguments. Configuration options may be separated by whitespace or optional whitespace and exactly one. Arguments may be enclosed in double quotes in order to specify arguments that contain spaces. Listing of client configuration options. The following keywords can be used in SSH client configuration files. Keywords are case insensitive and arguments are case sensitive. Any algorithm or method names that include an at sign are for experimental use only and not recommended for production. Host. Restricts the following declarations to be only for those hosts that match one of the patterns given after the keyword. The pattern is matched against the host name given on the command line. Match. Restricts the following declarations to apply only for hosts that match the specified criteria. For detailed information, see SSH man page. Address. Family. Specifies which address family to use when connecting. Valid arguments are any, inet, inet. Batch. Mode. If set to yes, passphrasepassword querying will be disabled. This is useful for running the ssh client from shell script that do not have an interactive user, and prevents accidentally blocking on a password prompt. Bind. Address. Specifies to use the specified address on the local machine as the source address of the connection. Challenge. Response. Authentication. Specifies whether to use challenge response authentication. This is mostly a legacy method and has been replaced by Kbd. Interactive. Authentication. Check. Host. IPDirects ssh to additionally check the host IP address in the knownhosts file. Cipher. Specifies the cipher to use for encrypting the session in protocol version 1. Note that use of protocol 1 is not recommended. Ciphers. Specifies the ciphers allowed for protocol version 2 in order of preference. Multiple ciphers must be comma separated. The ssh Q cipher command can be used to query supported ciphers. The following list is supported in Open. SSH 6. 7 3des cbc. Clear. All. Forwardings. Specifies that all local, remote, and dynamic port forwardings specified in the configuration files or on the command line be cleared. Compression. Specifies whether to use compression. Compression. Level. Specifies the compression level to use if compression is enabled. Connection. Attempts. Specifies the number of attempts to make before exiting. Connect. Timeout. Specifies the timeout in seconds used when connecting to the SSH server, instead of using the default system TCP timeout. Control. Master. Enables the sharing of multiple sessions over a single network connection. Control. Path. Specify the path to the control socket used for connection sharing as described in the Control. Master section above or the string none to disable connection sharing. Dynamic. Forward. Specifies that a TCP port on the local machine be forwarded over the secure channel, and the application protocol is then used to determine where to connect to from the remote machine. Escape. Char. Sets the escape character. Exit. On. Forward. Failure. Specifies whether ssh should terminate the connection if it cannot set up all requested dynamic, tunnel, local, and remote port forwardings. Forward. Agent. Specifies whether the connection to the authentication agent will be forwarded to the remote machine. Forward. X1. 1Specifies whether X1. DISPLAY set. Forward. X1. 1Trusted. If this option is set to yes, remote X1. X1. 1 display. Gateway. Ports. Specifies whether remote hosts are allowed to connect to local forwarded ports. Global. Known. Hosts. File. Specifies a file to use for the global host key database instead of etcsshsshknownhosts. GSSAPIAuthentication. Specifies whether user authentication based on GSSAPI is allowed. GSSAPI is typically used for Kerberos authentication, e. Active Directory. GSSAPIKey. Exchange. Specifies whether key exchange based on GSSAPI may be used. GSSAPIClient. Identity. If set, specifies the GSSAPI client identity that ssh should use when connecting to the server. GSSAPIDelegate. Credentials. Forward delegate credentials to the server. GSSAPIRenewal. Forces. Rekey. If set to yes then renewal of the clients GSSAPI credentials will force the rekeying of the ssh connection. GSSAPITrust. Dns. Set to yes to indicate that the DNS is trusted to securely canonicalize the name of the host being connected to. If no, the hostname entered on the command line will be passed untouched to the GSSAPI library. Hash. Known. Hosts. Indicates that ssh should hash host names and addresses when they are added to. These hashed names may be used normally by ssh and sshd, but they do not reveal identifying information should the files contents be disclosed. Hostbased. Authentication. Specifies whether to try rhosts based authentication with public key authentication, using the. Host. Key. Algorithms. Specifies the protocol version 2 host key algorithms that the client wants to use in order of preference. The following values are supported in Open. SSH 6. 7 ssh ed. Host. Key. Alias. Specifies an alias that should be used instead of the real host name when looking up or saving the host key in the host key database files. Host. Name. Specifies the real host name to log into. This can be used to specify nicknames or abbreviations for hosts. CONFIG. SYS Wikipedia. CONFIG. SYS is the primary configuration file for the DOS and OS2operating systems. It is a special ASCII text file that contains user accessible setup or configuration directives evaluated by the operating system during boot. CONFIG. SYS was introduced with DOS 2. The directives in this file configure DOS for use with devices and applications in the system. The CONFIG. SYS directives also set up the memory managers in the system. After processing the CONFIG. SYS file, DOS proceeds to load and execute the command shell specified in the SHELL line of CONFIG. SYS, or COMMAND. COM if there is no such line. The command shell in turn is responsible for processing the AUTOEXEC. BAT file. CONFIG. SYS is composed mostly of namevalue directives which look like variable assignments. In fact, these will either define some tunable parameters often resulting in reservation of memory, or load files, mostly device drivers and TSRs, into memory. In DOS, CONFIG. SYS is located in the root directory of the drive from which the system was booted. Some versions of DOS will probe for alternative filenames taking precedence over the default CONFIG. SYS filename if they exist While older versions of Concurrent DOS 3. CONFIG. SYS files at all, later versions of Concurrent DOS 3. Concurrent DOS XM, as well as Multiuser DOS, System Manager and REAL3. CCONFIG. SYS with C derived from Concurrent instead of CONFIG. SYS. Some versions of Multiuser DOS use a filename of CCONFIG. INI instead, whereas REAL3. MCONFIG. SYS. These operating systems support many additional and different configuration settings not known under MS DOSPC DOS, but they are stored in the binary repository named CCONFIG. BIN rather than in CCONFIG. INI. Both files are typically modified through a configuration utility named CONFIG. EXE only. Under DR DOS 3. Palm. DOS 1. 0, Novell DOS 7, Open. DOS 7. 0. 1, and DR DOS 7. DCONFIG. SYS with D derived from DR DOS, if present, will take precedence over CONFIG. SYS. 12 Since DR DOS 6. C would become drive D after loading the compression driver and the D in the file name came in handy as well, but it is commonly used to help maintain multiple configuration files in multi boot scenarios. In addition to this, Open. DOS 7. 0. 1 and DR Open. DOS 7. 0. 2 will look for a file named ODCONFIG. SYS,34 whereas some issues of DR DOS 7. DRCONFIG. SYS. Further, under DR DOS 6. SYS DR ext command can be used to change the default file extensions. 35 For example, with SYS L DR 7. Volume Boot Record would look for a renamed and modified IBMBIO. IBMBIO. COM and the IBMBIO. IBMDOS. 7. 03 and DCONFIG. IBMDOS. COM and DCONFIG. SYS, so that multiple parallel sets of files can coexist in the same root directory and be selected via a boot loader like LOADER, supplied with Multiuser DOS and DR DOS 7. The SHELL directive is enhanced to provide means to specify alternative AUTOEXEC. BAT files via P filename. COMMAND. COM will accept file extensions other than. BAT as well both features are also supported by 4. DOS. 6 Under DR DOS 6. CONFIG. SYS directive CHAINfilespec can be used to continue processing in the named file, which does not necessarily need to reside in the root directory of the boot drive. 1 DR DOS 7. CHAINfilespec,label to jump to a specific label in the given file. 34 DR DOS 7. SYS A parameter in order to copy the corresponding CONFIG. SYS and AUTOEXEC. BAT files alongside with the system files. Free. DOS implements a similar feature with its FDCONFIG. SYS configuration file. PTS DOS uses CONFIG. PTS. Both CONFIG. SYS and AUTOEXEC. BAT can be found included in the root folder of Windows 9. Windows 9. 8 boot drives, as they are based on DOS. Typically, these files are left empty, with no content, as they are not strictly required to run Windows programs from these versions. Windows ME does not even parse the CONFIG. SYS file during the Windows boot process,7 loading those settings from the Windows Registry instead HKLMSystemCurrent. Control. SetControlSession. ManagerEnvironment. Under Flex. OS, CONFIG. SYS is a binary file defining the resource managers and device drivers loaded. CONFIG. SYS directivesedit DR DOS 5. Defines labels in CONFIG. SYS as jump targets for CHAIN, DRSWITCH, GOTO, GOSUB and SWITCH directives. DOS 6. DR DOS 6. 0 and higher Similar to REM, but can be used also for in line comments following other CONFIG. SYS directives. See COMMENT. Under MS DOSPC DOS the inline comment is not ignored if put in double quotes. PTS DOS only Used to lead in in line comments in addition to the directive. DR DOS 3. 4. 1 and higher, Embedded DOS and Free. DOS only Displays a YesNo query and since DR DOS 5. CONFIG. SYS directives. Free. DOS does not support optional messages, but optional conditions in conjunction with boot menus defined with MENU and MENUDEFAULT. DOS 6. CONFIG. SYS directive, f. DEVICE or DEVICE instead of DEVICE. This variant is also supported by DR DOS. Free. DOS only Unconditionally execute the following CONFIG. SYS directive. ABORT PTS DOS only Specifies if programs can be aborted on errors. ACCDATE MS DOS 7. DR DOS 7. 0. 2 and higher3 Configures which drives should store file access date stamps in the reserved area of directory entries in FAT file systems. 8 AT PTS DOS only Conditional execution on AT compatible machines only. AUTOCHECK PTS DOS only Boot manager. AUTOFAIL OS2 only Configures verbosity of error messages. AUX DR DOS 7. 0. Changes internal default serial device driver COM1 to COM4 for AUX device. 3 AVAILDEV DOS 2. DR DOS 7. 0. 2 and higher only3 Disables the availability of character devices outside phantom DEV directory. BASEDEV OS2 only Loads base device driver into memory. BEEP DR DOS 7. 0. Emits a short beep, even if audible notifications are disabled via SWITCHESQ. 3 BOOTNEXT DRMK only Specifies operating system to be booted. BREAK DOS 2. 0 and DR DOS 3. OS2 Sets or clears extended CtrlC checking. BUFFERS DOS 2. 0 and DR DOS 3. OS2 Specifies the number of disk buffers to allocate. BUFFERSHIGH MS DOS 7. DR DOS 7. 0. 2 and higher and Free. DOS only Same as BUFFERS, but explicitly loads buffers into HMA or UMB like HIBUFFERS under DR DOS 6. CACHESIZE Embedded DOS 6 XL only Maximum number of 5. CACHETTL Embedded DOS 6 XL only Maximum time in ms before unused cache blocks are returned to system pool. CACHEFLUSH Embedded DOS 6 XL only Maximum time in ms before a dirty cache block gets flushed to disk. CALL OS2 4. 0 and higher only Similar to INSTALL under DOS, loads programs in CONFIG. SYS. Similar to RUN under OS2, but runs in foreground and halts CONFIG. SYS processing until return. CAPSLOCK DR DOS 7. Specifies whether the keyboard Caps Lock status is turned on or off. 3 CDDNAME PTS DOS only Specifies the name of the CD ROM hardware driver. CDDBUFFERS PTS DOS only Specifies the number of buffers for CD ROM access. CHAIN DR DOS 5. 0 and higher and Embedded DOS only Continues CONFIG. SYS processing in new file and since DR DOS 7. CLOCK PTS DOS only Specifies the type of clock used by the system. CLS DR DOS 6. 0 and higher only Clears screen. CODEPAGE OS2 only Specifies the OEM codepages. CMOSADDR PTS DOS only Specifies the address of the CMOS RAM. COLOR PTS DOS only Specifies colors for boot menus. COM1 DR DOS 7. 0. Defines count and logical order and configures IO address and timeout for COM1 device. COM2 DR DOS 7. 0. Defines count and logical order and configures IO address and timeout for COM2 device. COM3 DR DOS 7. 0. Defines count and logical order and configures IO address and timeout for COM3 device. COM4 DR DOS 7. 0. Defines count and logical order and configures IO address and timeout for COM4 device. COMAREA PTS DOS only Specifies buffer for DMA. COMMENT DOS 4. 0 and higher and Rx. DOS, ignored under DR DOS 7. Embedded DOS and under PTS DOS Redefines the lead in characters for CONFIG. SYS inline comments, or causes the following line to be ignored. COUNTRY DOS 3. 0 and DOS Plus 2. FIDDLOAD and DR DOS 3. OS2 Enables and configures international support. CPOS DR DOS 6. 0 and higher only Sets display cursor to specified position for configuration menus. CPSW MS DOS 4. 0. DR DOS 7. 0. 2 and higher3For codepage switching support. CPU PTS DOS only Specifies RAM refresh speed. CPU8. 8 PTS DOS only Conditional execution on 8.
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