08001 php network_error ai_generated partial

SQLSTATE[08001]: [Microsoft][ODBC Driver 17 for SQL Server]TCP Provider: Error code 0x2746

ID: php/pdo-sqlsrv-connection-failure

Also available as: JSON · Markdown · 中文
82%Fix Rate
88%Confidence
1Evidence
2023-09-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
php 8.1 active — — —
php 8.2 active — — —
php 8.3 active — — —
ODBC Driver 17 for SQL Server active — — —
ODBC Driver 18 for SQL Server active — — —

Root Cause

The PHP PDO_SQLSRV connection fails due to TLS protocol mismatch between the client ODBC driver and the SQL Server, often after SQL Server disables older TLS versions (e.g., TLS 1.0/1.1) or the client lacks a required cipher suite.

generic

中文

PHP PDO_SQLSRV 连接失败，原因是客户端 ODBC 驱动与 SQL Server 之间的 TLS 协议不匹配，常见于 SQL Server 禁用了较旧的 TLS 版本（如 TLS 1.0/1.1）或客户端缺少所需的密码套件。

Official Documentation

https://learn.microsoft.com/en-us/sql/connect/odbc/download-odbc-driver-for-sql-server

Workarounds

  1. 85% success Update the ODBC driver to version 18 and configure TLS settings in the connection string: `$conn = new PDO('sqlsrv:Server=host;Database=db;Encrypt=yes;TrustServerCertificate=yes;LoginTimeout=30;', $user, $pass);` 
    Update the ODBC driver to version 18 and configure TLS settings in the connection string: `$conn = new PDO('sqlsrv:Server=host;Database=db;Encrypt=yes;TrustServerCertificate=yes;LoginTimeout=30;', $user, $pass);`
  2. 80% success Add `'CryptoProtocolVersion' => 'TLSv1.2'` to the connection string or set the environment variable `ODBCSYSINI` to point to a custom `odbc.ini` with `CryptoProtocolVersion=TLSv1.2`. 
    Add `'CryptoProtocolVersion' => 'TLSv1.2'` to the connection string or set the environment variable `ODBCSYSINI` to point to a custom `odbc.ini` with `CryptoProtocolVersion=TLSv1.2`.

中文步骤

  1. Update the ODBC driver to version 18 and configure TLS settings in the connection string: `$conn = new PDO('sqlsrv:Server=host;Database=db;Encrypt=yes;TrustServerCertificate=yes;LoginTimeout=30;', $user, $pass);`
  2. Add `'CryptoProtocolVersion' => 'TLSv1.2'` to the connection string or set the environment variable `ODBCSYSINI` to point to a custom `odbc.ini` with `CryptoProtocolVersion=TLSv1.2`.

Dead Ends

Common approaches that don't work:

  1. Reinstalling the ODBC driver without updating TLS settings 70% fail

    The default ODBC driver installation may still use outdated TLS configurations; reinstalling alone does not change the TLS protocol negotiation behavior.

  2. Downgrading PHP to an older version (e.g., 7.4) 90% fail

    The TLS handshake failure is not a PHP version issue but a driver-level configuration problem; downgrading PHP does not alter the ODBC driver's TLS behavior.