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How to Configure Custom Connection Options for Your SSH Client

A practical OpenSSH guide to saved aliases and one-off options, covering custom ports, usernames, identity files, precedence, jump hosts, forwarding, token expansion, host-key verification, and debugging.
Length13 min Posted Quest giverVGSources Team
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Use OpenSSH’s ~/.ssh/config file to turn long connection commands into readable aliases, and use ssh -o Option=value for a temporary override. A profile can select a hostname, account, port, key, jump host, forwarding rule, and host-key policy; the effective result depends on command-line precedence and the order of matching configuration blocks.

Choose between a one-off option and a saved profile

OpenSSH accepts the same option syntax in two places. A command-line override is useful for a single test or an emergency connection:

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ssh -o Port=2222 -o IdentitiesOnly=yes [email protected]

For a connection you use repeatedly, put the settings in your per-user configuration file, ~/.ssh/config, then connect with the name in its Host line. This keeps ports, usernames, keys, proxies, and forwarding rules out of shell history and makes the intended connection easier to audit.

Method Best for Example Trade-off
-o Option=value A temporary change or a quick diagnostic ssh -o Port=2222 host Must be retyped and is easy to mistype
~/.ssh/config Repeatable aliases and groups of hosts ssh work-server Requires correct matching, ordering, and file permissions
/etc/ssh/ssh_config System-wide defaults supplied by an administrator Applied when the user file does not provide a value May be outside your control and affects multiple users

OpenSSH reads command-line options first, then the user file, then the system-wide file. For each individual parameter, the first value obtained is used unless the manual specifies an exception. That rule is why the position of a host block matters.

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Create a useful alias in ~/.ssh/config

Create the .ssh directory and the config file in your local home directory if they do not already exist. The file must not be writable by other users; apply owner-only permissions appropriate to your operating system. Private identity files should receive similarly restrictive permissions. On a managed computer, an administrator may also set defaults in /etc/ssh/ssh_config; your per-user file is the place to add personal aliases without changing settings for everyone.

A minimal work-server profile looks like this:

Host work-server
    HostName server.example.com
    User alice
    Port 2222
    IdentityFile ~/.ssh/id_ed25519_work
    IdentitiesOnly yes

Now run:

ssh work-server

Host is the local alias or matching pattern. HostName is the real DNS name or IP address sent to the SSH client. The other lines select the remote account, TCP port, private key, and authentication behavior.

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Configuration entries are keyword-and-argument pairs. Keywords are case-insensitive, while values are case-sensitive. If an argument contains spaces, quote it according to the configuration syntax. Keep indentation consistent for readability; OpenSSH treats the leading whitespace as presentation rather than a separate nesting language.

Core options and when to use them

Option What it controls Typical use
Host Starts a conditional block whose settings apply to matching names or patterns Create aliases, groups, and exceptions
HostName The actual hostname or IP address to contact Use a short nickname without changing DNS
User The remote login account Connect as a service account or a different administrator
Port The remote SSH TCP port; OpenSSH documents 22 as the default Reach a service listening on a nonstandard port
IdentityFile A private identity file used for authentication Select a work, personal, or project-specific key
IdentitiesOnly yes Restricts authentication to identities configured in files or on the command line, even when an agent offers additional keys Prevent the wrong agent key from being tried first
Include Loads additional configuration files; wildcard paths are expanded and processed lexically Split a large configuration into maintainable files

You can specify more than one IdentityFile. OpenSSH tries the configured identity files in sequence. This is useful when a host accepts several possible keys, but use IdentitiesOnly yes when you need to prevent an SSH agent from adding unrelated identities to the negotiation. The private key path is local; it does not identify a file that must exist on the server.

Control scope with patterns, defaults, and ordering

Use specific blocks before broad defaults

A pattern such as Host *.example.com can apply a shared default to a group. A Host * block applies defaults broadly. Put host-specific declarations before those wildcard blocks:

Host work-server
    HostName server.example.com
    User alice
    Port 2222
    IdentityFile ~/.ssh/id_ed25519_work
    IdentitiesOnly yes

Host *.example.com
    User defaultuser
    IdentityFile ~/.ssh/id_ed25519_default

Host *
    ServerAliveInterval 60

If the same parameter is encountered in a matching block and then again in a later matching block, the first obtained value remains effective. A later Host * line therefore cannot generally replace a value already selected by Host work-server. This is different from a last-line-wins configuration language. The same principle applies across included files, because included fragments are processed in lexical order.

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Use negated patterns for exceptions

Patterns support wildcards and negation. For example, this block covers most hosts in a domain but excludes one legacy system:

Host *.example.com !legacy.example.com
    User alice

The pattern is evaluated against the name used for the connection. If you type an alias, make sure the alias is what the block is intended to match, or provide the matching alias explicitly. A negated pattern does not make a later broad block override an earlier value; it controls whether the block applies at all.

Separate configuration with Include

When one file becomes difficult to review, load fragments from a directory:

Include ~/.ssh/config.d/*

Wildcard include paths are expanded and processed in lexical order. Use predictable names, such as numeric prefixes, when one fragment must be read before another. Keep the most specific host declarations early enough that a broad default does not claim the parameter first. Included files should be protected with the same care as the main configuration.

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Use Match for conditional rules

Host is the right tool for stable name-based groups. Match evaluates additional conditions, including host, originalhost, user, localuser, canonical, final, exec, and localnetwork. A conditional block can, for example, select a setting only when a particular local account or network is in use.

Match host internal.example.com user alice
    IdentityFile ~/.ssh/id_ed25519_work

Read the conditions carefully: they can change which values are obtained during parsing, and an exec condition may run a local command. CanonicalizeHostname can cause configuration files to be processed again with the canonical hostname, allowing a second matching pass to select additional settings. This can explain why a rule appears not to match on the first pass but affects the final result.

Connect through a bastion or jump host

Prefer ProxyJump for declarative jump routing

ProxyJump tells OpenSSH to connect to one or more intermediate hosts before reaching the destination. A simple profile is:

Host private-app
    HostName app.internal.example.com
    User appuser
    ProxyJump bastion.example.com

The jump host can include its own account and port:

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Host private-app
    HostName app.internal.example.com
    User appuser
    ProxyJump [email protected]:2200

Multiple jump hosts are comma-separated:

Host private-app
    ProxyJump first-bastion.example.com,second-bastion.example.com

The destination host’s configuration is not generally applied to the jump hosts. If a bastion needs a different username, port, or key, define a separate block for that bastion:

Host bastion.example.com
    User jumpuser
    Port 2200
    IdentityFile ~/.ssh/id_ed25519_bastion
    IdentitiesOnly yes

Host private-app
    HostName app.internal.example.com
    User appuser
    ProxyJump bastion.example.com

Use ProxyCommand when a command-based proxy is required

ProxyCommand runs a local command that must provide a connection to the target. A netcat-style HTTP CONNECT proxy can be expressed as:

Host proxied-server
    HostName server.example.com
    ProxyCommand /usr/bin/nc -X connect -x 192.0.2.0:8080 %h %p

ProxyJump is the higher-level, readable choice for SSH bastions. ProxyCommand is the lower-level option for an HTTP proxy, custom transport, or another program that speaks the required stream protocol. They compete: whichever is specified first prevents a later instance of the other from taking effect, so do not assume that adding a second directive will override the first. Shell metacharacters in commands must be quoted safely; the configuration manual places that responsibility on you.

Configure local and remote forwarding

Expose a remote service on a local port with LocalForward

LocalForward listens on the local side and sends traffic through the encrypted connection to a destination reachable from the remote side:

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Host database-tunnel
    HostName bastion.example.com
    User tunneluser
    LocalForward 127.0.0.1:15432 db.internal.example.com:5432

After ssh database-tunnel is connected, a program on the local machine can use 127.0.0.1:15432; the SSH server side attempts to reach db.internal.example.com:5432. The same directive can forward a local Unix socket when the platform and syntax support it. Bind to a loopback address when only the local machine should use the tunnel, rather than exposing the listener on every local interface.

Publish a remote listener with RemoteForward

RemoteForward creates a listener on the remote side and forwards connections back through the local side. With a fixed destination:

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Host remote-callback
    HostName server.example.com
    User alice
    RemoteForward 127.0.0.1:9000 127.0.0.1:9000

When no fixed destination is supplied, RemoteForward can act as a SOCKS proxy, allowing the remote listener to request connections through the local side. Treat remote listeners as exposed network services: bind deliberately, restrict access where possible, and remove the rule when it is no longer needed. Forwarding may also be limited by server-side policy, so a correct client profile cannot override an administrator’s restrictions.

Run a command after connecting with RemoteCommand

RemoteCommand runs a command on the remote machine after a successful connection:

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Host logs-shell
    HostName server.example.com
    User alice
    RemoteCommand tail -f /var/log/app.log

This changes the session’s purpose from a normal interactive shell to the configured command. Use it only on profiles where that behavior is intentional, and keep it separate from an alias intended for ordinary administration.

Use connection tokens safely

Several directives substitute tokens at connection time:

Token Value
%h Remote hostname
%p Remote port
%r Remote username
%n Original hostname supplied by the user
%d Local home directory
%C A hash of connection fields
%j The configured ProxyJump value

Tokens are particularly useful in ProxyCommand, where %h and %p pass the destination host and port to the proxy program. Because some directives construct shell commands, quote values containing shell metacharacters and do not insert untrusted text into a command without understanding how the local shell will parse it. Proxy directives accept only the token set supported by that directive; do not assume every token works everywhere. %n is useful when canonicalization changes the eventual hostname but a proxy still needs the name originally typed.

Keep host-key verification enabled

Custom connection profiles do not make host identity verification optional. StrictHostKeyChecking ask is the default behavior described by OpenSSH: new keys prompt for confirmation, while previously known keys are verified automatically. A changed key is treated as a warning that requires investigation.

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Setting Behavior When it fits
yes Requires manual addition of new host keys and refuses changed keys Highly controlled environments where keys are provisioned separately
accept-new Automatically adds new keys but still rejects changed keys Environments that can safely trust first contact but must detect replacement
ask Prompts before adding a new key and verifies known keys automatically The documented default for interactive use

Do not weaken host-key checking merely to silence a warning. A changed key can indicate a rebuilt server, a stale entry, or an active interception attempt; verify the replacement key through a trusted channel before accepting it. A convenient alias does not change the identity of the host you are connecting to.

Inspect the effective configuration before changing anything

Aliases fail most often because a pattern does not match, a broad block claims a value first, or a jump host is configured under the wrong name. Use this workflow:

  1. Print the resolved values. Run ssh -G work-server. This displays the effective configuration generated for the alias when the installed OpenSSH client supports the option.
  2. Trace the connection. Run ssh -vvv work-server. The verbose output shows option parsing, name resolution, key selection, proxy setup, and host-key decisions.
  3. Check the name that is matched. Confirm that the text after ssh matches the intended Host pattern. If hostname canonicalization is enabled, remember that a second parsing pass may occur.
  4. Check permissions. Make sure ~/.ssh/config and private keys are not writable by other users. An SSH client may refuse to use files that are too permissive.
  5. Check ordering. Move host-specific declarations above Host * or other broad blocks. The first obtained value wins for each parameter.
  6. Check the jump host separately. Give the bastion its own matching block when it needs a different account, port, or identity file.

For a one-time experiment, reproduce the suspected setting with -o rather than editing several blocks:

ssh -o HostName=server.example.com -o User=alice -o Port=2222 -o IdentityFile=~/.ssh/id_ed25519_work -o IdentitiesOnly=yes work-server

If the command-line version works but the alias does not, compare the output of ssh -G with the options you supplied and focus on matching and ordering. If a key is rejected, verify both the path and the account named by User; a valid private key for one account does not grant access to another.

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Practical profile patterns

Separate keys for two environments

Host production
    HostName prod.example.com
    User deploy
    IdentityFile ~/.ssh/id_ed25519_prod
    IdentitiesOnly yes

Host staging
    HostName stage.example.com
    User deploy
    IdentityFile ~/.ssh/id_ed25519_stage
    IdentitiesOnly yes

The aliases make it difficult to send a staging key to production accidentally and make the selected identity visible in the profile.

Apply a shared port and account to a host group

Host *.lab.example.com
    User researcher
    Port 2200
    IdentitiesOnly yes

Place any exception above this group block so its specific values are obtained first.

Keep a forwarding profile distinct from a normal shell profile

Host metrics-tunnel
    HostName gateway.example.com
    User tunnel
    IdentityFile ~/.ssh/id_ed25519_gateway
    IdentitiesOnly yes
    LocalForward 127.0.0.1:19090 metrics.internal.example.com:9090

Using a dedicated alias prevents a routine shell login from unexpectedly opening a tunnel and makes the purpose apparent in scripts and documentation.

Combine a bastion with a tunnel

Host private-db
    HostName db.internal.example.com
    User dbadmin
    ProxyJump bastion.example.com
    LocalForward 127.0.0.1:15432 db.internal.example.com:5432

Use this only when the local endpoint and the destination are deliberately chosen. The jump route controls how SSH reaches the database host; the forwarding rule controls which local program can reach a database service after the session is established.

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Portability and security checklist

  • Use options supported by the OpenSSH client installed on the machine; ssh -G availability and some conditional features depend on client version.
  • Keep reusable settings in ~/.ssh/config; reserve -o for temporary overrides and diagnostics.
  • Put narrow Host blocks before wildcard defaults because the first obtained value is retained.
  • Use HostName to separate a friendly alias from the actual destination.
  • Use IdentitiesOnly yes when agent-provided keys could cause unwanted authentication attempts.
  • Define jump hosts explicitly when their account, port, or key differs from the destination.
  • Review every LocalForward, RemoteForward, and RemoteCommand rule as an operational capability, not merely a convenience.
  • Preserve host-key verification and investigate changed keys instead of disabling checks.
  • Quote shell-sensitive ProxyCommand arguments and verify token expansion with verbose output.
  • Check local and server-side firewall rules when a custom port or forwarding listener is unreachable; changing the client option does not open a blocked port.
  • Document aliases for teammates and automation, but avoid copying private keys or embedding secrets in configuration files.

Frequently asked configuration questions

How do I set a custom SSH port? Add Port 2222 inside the matching Host block, or use ssh -o Port=2222 host for one connection. The OpenSSH default is port 22.

How do I use a different username? Set User accountname in the profile. You can also write accountname@host on the command line, but putting the account in an alias avoids repeating it.

How do I select a private key? Add one or more IdentityFile lines. Add IdentitiesOnly yes if an SSH agent has other keys that should not be offered.

Why did my wildcard default override the setting I expected? It usually did not override it; the broad block was parsed first and supplied the first value. Move the specific block earlier and inspect the result with ssh -G.

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Can one alias use a jump host with a different key? Yes. Give the bastion its own Host block with its account, port, and IdentityFile, then refer to that host in ProxyJump.

Should I use ProxyJump or ProxyCommand? Use ProxyJump for ordinary SSH bastions and chains. Use ProxyCommand when a local proxy program, such as netcat through an HTTP CONNECT proxy, is required.

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Why does a host-key warning still appear when the alias works? The alias only changes connection parameters. OpenSSH still compares the destination’s key with the known-hosts record. Investigate a changed key through a trusted channel instead of disabling checking.

Bottom line

Put repeatable connection choices in ~/.ssh/config, use -o for temporary tests, and treat each Host block as a scoped profile. Start with HostName, User, Port, and IdentityFile; add IdentitiesOnly, ProxyJump, forwarding, or conditional rules only when their behavior is understood. Because OpenSSH keeps the first value it obtains for each parameter, deliberate ordering, explicit jump-host blocks, strict file permissions, safe quoting, and intact host-key verification are what make a short alias dependable rather than merely convenient.

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Frequently Asked Questions

Where is the SSH client configuration file?

Per-user settings belong in ~/.ssh/config. System-wide defaults are normally in /etc/ssh/ssh_config and apply when the user file has not supplied a value.

What is the safest way to test an option before saving it?

Use ssh -o Option=value for a single connection, then compare ssh -G alias with the intended values before editing the profile.

Why is my IdentityFile ignored?

A previous matching block may already have supplied an identity, or an agent may be offering additional keys. Move the specific block earlier and use IdentitiesOnly yes when only configured files should be tried.

Can I include several SSH configuration files?

Yes. Include supports wildcard paths, which are expanded and processed lexically. Use predictable filenames when ordering matters.

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Does ProxyJump automatically use the destination host’s settings for the bastion?

No. Configure the bastion explicitly if it needs a different user, port, or key.

What should I do when a host key changes?

Stop and verify the replacement key through a trusted channel. Do not weaken StrictHostKeyChecking just to suppress the warning.

The Bottom Line

Use ~/.ssh/config for dependable, reusable SSH profiles and ssh -o for one-off changes. Put specific blocks first, inspect effective settings with ssh -G, trace failures with ssh -vvv, and preserve key and host verification while adding ports, identities, jump hosts, or forwarding.

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