title: Failed to bind to server ldap:// Error: Can't contact LDAP server
body: <p>We are running a Linux 2.6.32-358.23.2.el6.x86_64 kernel and keep seeing the following messages in /var/log/messages periodically showing up on our user space server. When the messages appear we also have users stating that they are unable to access network drive space.</p>
  
  <pre><code> Nov  5 20:10:40 &lt;server_name&gt; smbd[15502]:   failed to bind to server ldap://&lt;server-ip&gt; with dn="cn=user,dc=some_domain,dc=some_domain,dc=some-domain" Error: Can't contact LDAP server
   Nov  5 20:10:40 &lt;server_name&gt; smbd[15502]:   #011(unknown)
   Nov  5 20:10:41 &lt;server_name&gt; smbd[15503]: [2013/11/05 20:10:41.146650,  0] lib/smbldap.c:1225(smbldap_connect_system)
   Nov  5 20:10:41 &lt;server_name&gt; smbd[15503]:   failed to bind to server ldap://&lt;server-ip&gt; with dn="cn=user,dc=some_domain,dc=some_domain,dc=some-domain" Error: Can't contact LDAP server
   Nov  5 20:10:41 &lt;server_name&gt; smbd[15503]:   #011(unknown)
   Nov  5 20:10:42 &lt;server_name&gt; smbd[1655]: [2013/11/05 20:10:42.868838,  0] lib/smbldap.c:1225(smbldap_connect_system)
   Nov  5 20:10:42 &lt;server_name&gt; smbd[1655]:   failed to bind to server ldap://&lt;server-ip&gt; with dn="cn=user,dc=some_domain,dc=some_domain,dc=some-domain" Error: Can't contact LDAP server
   Nov  5 20:10:42 &lt;server_name&gt; smbd[1655]:   #011(unknown)
   Nov  5 20:10:48 &lt;server_name&gt; smbd[15504]: [2013/11/05 20:10:48.531242,  0] lib/smbldap.c:1225(smbldap_connect_system)
   Nov  5 20:10:48 &lt;server_name&gt; smbd[15504]:   failed to bind to server ldap://&lt;server-ip&gt; with dn="cn=user,dc=some_domain,dc=some_domain,dc=some-domain" Error: Can't contact LDAP server
   Nov  5 20:10:48 &lt;server_name&gt; smbd[15504]:   #011(unknown)
  </code></pre>
  
  <p>Linux users are unable to authenticate, but windows users can.</p>
  
  <p>None of our other linux servers are showing error messages like these. Not even our ldap server. </p>
  
  <p>What should we look for in regards to the cause of these error and what can we do to resolve this issue? Any suggestions would be appreciated.</p>
  
  <p>---- Quick update -----</p>
  
  <p>We have now discovered that we can resolve the authentication problems with the following command being ran on our server running ldap:</p>
  
  <pre><code> service slapd restart
  </code></pre>
  
  <p>However, we still cannot determine what is causing this issue.</p>