Reconcile close reason tracking: feature branch's MarkClosed() and
ShouldSkipFlush/FlushAndCloseAsync now use main's ClientClosedReason
enum. ClosedState enum retained for forward compatibility.
Reject connections that send no_responders:true without headers:true,
since the 503 HMSG response requires header support. Add three tests:
connection rejection, acceptance with headers, and 503 delivery flow.
When a client sends CONNECT {"verbose":true}, the server now responds
with +OK\r\n after successfully processing CONNECT, PING, SUB, UNSUB,
and PUB/HPUB commands, matching the Go NATS server behavior.
Accumulate InMsgs/InBytes locally per ReadAsync cycle and flush once,
reducing from 4 Interlocked operations per published message to 2 per
read cycle. This matches the Go server's approach of batching stats.
When a PUB with a reply-to subject has no matching subscribers and the
sender opted into no_responders, send a 503 HMSG back on the reply
subject so request-reply callers can fail fast instead of timing out.
Verify channel-based write loop behavior: QueueOutbound writes data
to client socket, PendingBytes tracking, slow consumer detection
when MaxPending is exceeded, close reason propagation, and server
stats incrementation on slow consumer events.
- Make ConnectReceived thread-safe with Volatile.Read/Write (accessed from auth timeout task and command pipeline)
- Include authTimeoutTask in Task.WhenAny to propagate exceptions
- Clear nonce after authentication with CryptographicOperations.ZeroMemory
- Avoid closure allocation on publish permission cache hot path (method group)
- Update AuthTimeout default to 2s to match Go server
Fix NKey nonce verification: the NATS client signs the nonce string
(ASCII bytes of the base64url-encoded nonce), not the raw nonce bytes.
Pass the encoded nonce string bytes to the authenticator for verification.
Subscriptions and message routing now go through account-specific SubLists
instead of a single global SubList. Clients in different accounts cannot
see each other's messages. When no account is specified (or auth is not
configured), all clients share the global $G account.
Wire AuthService into NatsServer and NatsClient to enforce authentication
on incoming connections. The server builds an AuthService from NatsOptions,
sets auth_required in ServerInfo, and generates per-client nonces when
NKey auth is configured. NatsClient validates credentials in ProcessConnect,
enforces publish/subscribe permissions, and implements an auth timeout that
closes connections that don't send CONNECT in time. Existing tests without
auth continue to work since AuthService.IsAuthRequired is false by default.
Add TlsMixedModeTests verifying that a server with AllowNonTls=true
accepts both plaintext and TLS clients on the same port. Add
MonitorTlsTests verifying that /connz reports TlsVersion and
TlsCipherSuite for TLS-connected clients.
Integrate TLS support into the server's connection accept path:
- Add SslServerAuthenticationOptions and TlsRateLimiter fields to NatsServer
- Extract AcceptClientAsync method for TLS negotiation, rate limiting, and
TLS state extraction (protocol version, cipher suite, peer certificate)
- Add InfoAlreadySent flag to NatsClient to skip redundant INFO when
TlsConnectionWrapper already sent it during negotiation
- Add TlsServerTests verifying TLS connect+INFO and TLS pub/sub
