# 21. Appendix

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Server & client versions compatibility

## 21.8. Server & client versions compatibility

The RPC protocol has changed between 2.7 and 3.0 versions. Thus, not all clients can connect to all servers. For best results, the version should be identical on both ends of ODBC and JDBC connections. However, the following table shows which combinations should generally be successful.

Driver/Server | 4.0 | 3.5 | 3.2 | 3.1 | 3.0 | 2.7 | 2.5 | 2.1
4.0 | Y | Y | Y | Y | Y | N | N | N
3.5 | Y | Y | Y | Y | Y | N | N | N
3.2 | Y | Y | Y | Y | Y | N | N | N
3.1 | Y | Y | Y | Y | Y | N | N | N
3.0 | Y | Y | Y | Y | Y | N | N | N
2.7 | N | N | N | N | N | Y | Y | Y
2.5 | N | N | N | N | N | Y | Y | Y
2.1 | N | N | N | N | N | Y | Y | Y

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