Description:
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DES-CRYPT password digest works nice, but if the user is set up with SHA-1 password digest a connection can not be made.

Test script:
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$host = 'server:/path/to/database.ib';

$dbh = ibase_connect($host, $username, $password);

Actual result:
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ibase_connect(): Your user name and password are not defined. Ask your database administrator to set up a Firebird login.