PHP Warning: ldap_bind (): cannot communicate with server: cannot communicate with LDAP server

Question

I have a problem with my php script:

PHP Warning: ldap_bind (): Cannot bind to server: cannot connect to LDAP server ....

ldap_connect() says “ ldap_bind() ”, but ldap_bind() fails, how to fix this problem?

Answer 1

Connection opens a session. Bind is what really authenticates you. This way you are connected but not logged in with valid credentials.

Answer 2

If this error is on RHEL7 (CentOS7) due to restrictions prohibiting SELinux, HTTPD can be used.

In the list of allowed default LDAP ports 389 and 636, you can unlock:

 setsebool -P httpd_can_network_connect 1 

You can test the restriction by trying the socket on the LDAP server:

 fsockopen('LDAP-Server-IP', 389); 

He will give "Permission Denied", indicating that he is blocked, not a question.

Also check the SELinux audit log file to block other things.

Answer 3

I have no experience that matches what I read here. I tried

 $ds=ldap_connect("goblydeegook",336); if($ds) echo "successful"; 

and I get a "successful" answer

Answer 4

Sometimes the problem will depend on your environment (Linux, Windows ...) Try to associate with one of the following options:

 $connect = ldap_connect("ldap://".$ldap_server); $auth_user = 'CN=XXX,OU=XXX,DC=XXX,DC=com'; $bind = ldap_bind($connect, $auth_user , $auth_pass); 

or

 $bind = ldap_bind($connect, 'YourDomaine\\'.$auth_user , $auth_pass); 

Answer 5

The ldap_bind () function requests three parameters:

• resource id
• a rdn
• password associated with rdn, rdn and password are optional

if you link using only the resource identifier: -

 // $ldap=ladap_connect(*hostname*,*port*); // ldap_connect() returns a resource id ldap_bind() returns a boolean value(true or false) ldap_bind($ladp); //annonymous bind $lb=ldap_bind($ldap,"uid=xxx,ou=something,o=hostname.com","password"); //used to authenticate 

this should work, if not, then you are using invalid credentials.