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The client is unable to establish a connection.

The following error message is output to $ALTIBASE_HOME/trc/altibase_boot.log.
The following error message is output to $ALTIBASE_HOME/trc/altibase_boot.log.


ERR-7101d(errno=11) Protocol header error.(TCP
Protocol processing failed. Close connection...


The error description can be viewed with the AltiErr utility as below. 

This error message is written to altibase_boot.log when a client of a version incompatible with the server tried to establish a connection.

This error keeps its message history and has no affect on the Altibase server.


If this error persists, find the client that is attempting to connect and re-install it with a version compatible with the server. 

1. Check the server version with the following command:

2. Check the client version with the following command:


1. For ALTIBASE HDB 5.3.1 and below, the cm protocol version of the server and client must be identical for the client to connect to the server.

2. For ALTIBASE HDB 5.3.3 and above, backwards compatibility for the server and client is supported.

    The client can connect to a server of the same or higher version regardless of its cm protocol version whereas, connection fails if the client is of a higher version than the server.

    In this context, the first three numbers of a product version are denoted as the version (the fourth and succeeding numbers which indicate the patch versions are irrelevant).

# Connection examples of server and client compatibility for different versions


Server Version

Client Version



Server Version > Client Version 
(5.3.3 and above)




Backward compatibility is supported for 5.3.3 and above.

Server Version > Client Version 
(5.3.1 and below) 




Backward compatibility is supported only if the version of both the server and client is 5.3.3 and above. 
Since the client version is older than 5.3.3, backward compatibility is not supported. For 4.3.9, connection is successful only if the cm protocol version is the same.

ServerVersion < Client Version 




If the version of the client is newer than the server, connection fails regardless of the Altibase version. 
The version of the client must be the same or lower than the server.






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