MSSQL Server 2012-Asterisk by freetds

I am facing error "cel_tds.c:418 tds_error_handler:Read from SQL server failed when connecting asterisk with MSSQL Server 2012 by freetds driver. How to fix this ???
b’coz asterisk stop working after coming this error .If Anyone have this solution of this error ,ugently give the reply soon

This is likely to be a FreeTDS issues, not an Asterisk one. If this is the only information logged, I’d say it was insufficient to progress the problem.