Error map
ssh-agent: keys lost after reboot / passphrase asked every time macOS: Enter passphrase for key '/Users/me/.ssh/id_ed25519': (every time after restart)
macOS · layer 6, Platform & cloud
Centre: this error. First ring: errors it is linked with (12). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.
Directly related (12)
kex_exchange_identification: Connection closed by remote host
The SSH connection was closed before the handshake — server overload, rate limiting, or a proxy/firewall interfering.
perl: warning: Setting locale failed / bash: warning: setlocale: LC_ALL: cannot change locale
Your session asks for a locale (often forwarded by SSH from your Mac/PC) that isn’t generated on the server.
ssh: connect to host x port 22: Connection refused
The server answered, but nothing is listening on the SSH port — sshd isn’t running, it uses another port, or a firewall actively…
client_loop: send disconnect: Broken pipe (SSH session drops when idle)
The SSH connection was cut — usually an idle timeout on a NAT router, firewall or the server, sometimes a network change.
Git: Permission denied (publickey). fatal: Could not read from remote repository.
SSH authentication to GitHub/GitLab/Bitbucket failed — no key, wrong key, or the key isn’t added to your account.
ssh: connect to host x port 22: Connection timed out
SSH packets get no reply — a firewall/security group drops them, the server is off, or the IP is wrong.
ssh: connect to host github.com port 22: Connection timed out
Outbound SSH on port 22 is blocked (firewall, corporate or public Wi-Fi).
WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! (ssh host key changed)
The server’s SSH host key differs from the one saved in ~/.ssh/known_hosts — usually because the server was rebuilt or the IP was…
Host key verification failed. fatal: Could not read from remote repository.
SSH doesn’t trust the server’s host key — first connection in a non-interactive environment, or the key changed.
Received disconnect: Too many authentication failures
Your SSH agent offered too many keys before the right one, and the server cut the connection (MaxAuthTries, default 6).
ssh: /Users/me/.ssh/config: line 5: Bad configuration option: usekeychain
The `UseKeychain` option in `~/.ssh/config` is only understood by Apple's OpenSSH, not by a Homebrew/other OpenSSH.
Git: git: 'credential-osxkeychain' is not a git command. See 'git --help'
Git is configured to use the macOS keychain helper, but the helper binary isn't found by the Git you're running.
Two steps away (36)
HTTP 407 Proxy Authentication Required
A proxy between you and the server requires credentials before it will forward your request.
HTTP 408 Request Timeout
The server closed the connection because the client took too long to send the complete request.
API Request Timed Out (ETIMEDOUT / ReadTimeout / timeout of 30000ms exceeded)
The client gave up waiting — either for the connection to open or for the response to arrive.
bash: command not found
The shell can’t find an executable with that name in any directory on your PATH.
WARNING: UNPROTECTED PRIVATE KEY FILE! Permissions 0644 for 'key.pem' are too open
SSH refuses to use a private key that other users can read; it must be readable only by you (chmod 600).
sudo: unable to resolve host <hostname>: Name or service not known
The machine’s hostname isn’t in /etc/hosts (or DNS), so sudo prints this warning — usually after changing the hostname.
Error: connect ECONNREFUSED 127.0.0.1:5432
Nothing is listening at that host:port — the target service is down or you’re connecting to the wrong address.
connect: Network is unreachable (ENETUNREACH)
The host has no route to the destination network — no default gateway, interface down, or trying IPv6 without IPv6 connectivity.
connect: No route to host (EHOSTUNREACH)
The destination host isn’t reachable — it’s down, on another subnet without routing, or a firewall rejects with “host unreachable…
Error: socket hang up / read ECONNRESET
The other side closed the TCP connection abruptly while your client was still using it.
Windows Update error 0x8024402C (cannot connect to update server)
Windows Update can’t reach Microsoft’s servers — a proxy, DNS, firewall or WSUS setting is blocking the connection.
Error 0x80072EE7 (Windows Update / Microsoft Store: server name could not be resolved)
Windows can’t resolve Microsoft’s server names — DNS, hosts file, proxy or firewall problems.
Git: ! [rejected] … (fetch first) — error: failed to push some refs
The remote branch has commits you don’t have locally, so Git refuses to overwrite them. Pull (merge or rebase) first, then push.
fatal: not a git repository (or any of the parent directories): .git
You ran a Git command outside a Git working tree.
Linux: Permission denied
Your user (or the service user) lacks read/write/execute permission on a file, directory or one of its parents.
Cloudflare Error 1020: Access Denied
A Cloudflare firewall/WAF custom rule blocked the request — the visitor’s IP, country, user agent or request pattern matched a bl…
Azure SQL: Cannot open server 'x' requested by the login. Client with IP address 'y' is not allowed to access the server (Error 40615)
The Azure SQL server firewall doesn’t allow your client’s IP address.
Cloudflare Error 1005: Access denied — The owner of this website has banned the autonomous system number (ASN) your IP address is in
The site owner blocked your network provider (ASN) — common for VPNs, cloud/data-center IPs and some mobile carriers.
error: RPC failed; HTTP 400 curl 22 / curl 92 HTTP/2 stream was not closed cleanly — the remote end hung up unexpectedly
A large HTTPS push/clone broke mid-transfer — size limits, proxies or flaky HTTP/2.
fatal: unable to access 'https://github.com/…': Could not resolve host: github.com
DNS lookup for the Git host failed from this machine.
fatal: early EOF — fatal: index-pack failed
A clone or fetch was cut off mid-transfer.
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY
apt can’t verify a repository’s signature because the repo’s signing key isn’t installed (or has expired/rotated).
SELinux is preventing ... / avc: denied { read } for pid=... (permission denied despite correct permissions)
SELinux blocked the access — file permissions look fine, but the file’s security context or a boolean doesn’t allow the service t…
AADSTS50053: Your account is locked (Smart Lockout) / sign-in blocked due to suspicious activity
Too many failed sign-ins (or sign-ins from a malicious IP) triggered Entra Smart Lockout.
Azure AD (Entra ID): AADSTS700016 Application not found in the directory
The client ID in your sign-in request doesn’t exist in the tenant you’re authenticating against.
HTTP 401 Unauthorized
The request has no valid authentication credentials — you need to log in or send a valid token.
JWT Expired / Invalid Token
The JSON Web Token sent with the request is expired, malformed or signed with a different key, so the API rejects it (usually wit…
passwd: Authentication token manipulation error
passwd couldn’t update the password — the root filesystem is read-only, /etc/shadow has wrong permissions/attributes, or a PAM ru…
AADSTS50126: Error validating credentials due to invalid username or password
Microsoft Entra ID (Azure AD) rejected the sign-in because the username or password is wrong — or the flow can’t use passwords fo…
Azure CLI: Please run 'az login' to setup account / No subscription found
The Azure CLI has no signed-in account (or its token expired), or the account has no subscriptions.
Homebrew: Error: Your Command Line Tools (CLT) are too outdated. Update them from Software Update / Please update to the latest macOS
Homebrew requires a newer Command Line Tools version than the one installed.
Homebrew: Error: It seems there is already an App at '/Applications/Chrome.app'
A cask install failed because the app is already installed manually (or a leftover exists).
macOS (Apple Silicon): zsh: bad CPU type in executable: ./tool
You ran an Intel (x86_64) program on an Apple Silicon Mac without Rosetta 2 (or an arm64 binary on an Intel Mac).
fatal: Authentication failed for 'https://github.com/x/y.git/'
HTTPS authentication to the Git host failed — wrong or expired credentials, or a password used where a token is required.
npm ERR! code 128 — An unknown git error occurred (git dependency install)
npm failed to fetch a dependency that points to a Git repository.
macOS: security: SecKeychainSearchCopyNext: The specified item could not be found in the keychain. (errSecItemNotFound -25300)
A lookup in the macOS keychain found no matching item, or access to it was denied.
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