La siguiente tabla describe los errores que pueden ocurrir en conexiones de red.
| Código | Descripción |
| -10001 | The actual connection to the database has been disrupted. |
| -10002 | The connection for this process has been disrupted. |
| -10003 | Bad connection parameters. |
| -10020 | No server was selected while using OP Select 4D server. |
| -10021 | No server was found while using OP Find 4D server. |
| -10030 | Desynchronization has occured during the write cycle. |
| -10031 | Desynchronization has occured during the read cycle. |
| -10033 | Incorrect data size during read cycle. |
| -10050 | Unknown option in Get/SetOption. |
| -10051 | Incorrect value in Get/SetOption. |
