No worthy mechs found

Hi,
I use the following code for calling sasl_client_init():

    callback->id = SASL_CB_GETPATH;

    callback->proc = (sasl_callback_ft) &GetPluginPath;

    callback->context = (void *)(sasl_plugin_dir_path.c_str());

    ++callback;


    /* user */

    callback->id = SASL_CB_USER;

    callback->proc = (sasl_callback_ft) &Simple;

    callback->context = const_cast<char *>(user_name_.c_str());

    ++callback;


    /* termination */

    callback->id = SASL_CB_LIST_END;

    callback->proc = NULL;

    callback->context = NULL;

    ++callback;

    rc = sasl_client_init(callbacks);


sasl_client_init() returned 0.

But the following:

    const char *mechusing, *mechlist = "GSSAPI";


    do {

      currentReturnCode = sasl_client_start(sconn_, /* the same context
from above */

           mechlist, /* the list of mechanisms

            from the server */

            NULL, /* filled in if an

            interaction is needed */

            &out, /* filled in on success */

            &outlen, /* filled in on success */

            &mechusing);

gave me -4.

I saw this auth log:

  Mar 14 09:01:33 5f4a350528ca client-test: No worthy mechs found

Under CYRUS_SASL_PLUGINS_DIR :

# ls /usr/lib/sasl2

libanonymous.la        libcrammd5.la        libdigestmd5.la        libgs2.la
       libgssapiv2.la        libotp.la        libplain.la        libscram.la

libanonymous.so        libcrammd5.so        libdigestmd5.so
 libgs2.so        libgssapiv2.so        libotp.so        libplain.so
 libscram.so

libanonymous.so.3      libcrammd5.so.3      libdigestmd5.so.3
 libgs2.so.3      libgssapiv2.so.3      libotp.so.3      libplain.so.3
 libscram.so.3

libanonymous.so.3.0.0  libcrammd5.so.3.0.0  libdigestmd5.so.3.0.0
 libgs2.so.3.0.0  libgssapiv2.so.3.0.0  libotp.so.3.0.0  libplain.so.3.0.0
 libscram.so.3.0.0


Is there any lib which was missing ?

Thanks