Client error 2073 means the MySQL client library failed to fetch session data from the server, usually after a network hiccup, timeout, or incorrect SSL settings.
MySQL Error 2073: CR_CANT_GET_SESSION_DATA occurs when the client library cannot retrieve session data after connecting. Check network stability, increase net_read_timeout, and verify SSL parameters to resolve the issue.
Can't get session data: %s CR_CANT_GET_SESSION_DATA was added in 8.0.29.
The client error 2073 appears with the message "Can't get session data: %s" when the MySQL client or connector cannot retrieve session state information from the server after connection establishment. The condition name was added in MySQL 8.0.29 and typically signals an interrupted or incomplete handshake phase.
Because the problem happens before any SQL statement executes, applications may see abrupt connection drops, authentication failures, or empty result sets.
Addressing it quickly is critical for transaction consistency and application uptime.
The error surfaces during the connection phase, right after the server accepts the TCP socket but before the server sends complete session metadata.
Any disruption in this narrow window causes the client to raise CR_CANT_GET_SESSION_DATA.
It is frequent in high-latency networks, containerized deployments with aggressive health checks, or TLS-enabled connections where certificate validation misfires.
Repeated 2073 errors cause connection churn, slow application response times, and potential data loss if retry logic is missing. Production services may exhaust connection pools and lock tables while waiting for healthy sessions.
Resolving the root cause restores stable connectivity, reduces server resource waste, and improves overall database reliability.
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Unstable links, VPN tunnels, or overloaded NICs drop packets during the handshake, preventing the client from receiving full session data.
Values like net_read_timeout or connect_timeout set too low can expire while the server assembles session information, especially on busy instances.
Certificate mismatches or outdated OpenSSL versions interrupt the secure handshake, causing the client to bail out before session data arrives.
Middleboxes that terminate or inspect MySQL traffic may strip or delay packets, breaking the session retrieval step.
Edge cases in MySQL 8.0.29-8.0.31 showed leaked file descriptors that blocked session writes, triggering 2073 on clients.
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No. Authentication succeeds earlier. The error indicates the client could not fetch session data after login.
Usually not. Higher timeouts simply allow more time for slow networks. Queries are unaffected.
Sporadic occurrences may be harmless, but frequent events indicate deeper network or configuration problems that deserve attention.
Galaxy stores per-connection timeout profiles and highlights SSL mismatches, reducing handshake failures that trigger 2073.
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