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If phpLDAPadmin rejects an administrator login, first identify the server entry’s login/auth_type, then use the complete distinguished name (DN) for the naming context you selected. In the usual cookie or session modes, enter a DN such as cn=admin,dc=example,dc=org—not simply admin. A configuration database uses a different identity, commonly cn=admin,cn=config. Also check whether phpLDAPadmin can search for the account, whether its configured base and object-class filter include that account, and whether LDAP itself permits the bind. The message “Invalid Username or Password” is generic: it can indicate a wrong DN, password, search, naming context, or permission.
Why the admin account is rejected
phpLDAPadmin does not have one universal administrator username. It passes the credentials you supply to a particular LDAP naming context, using the authentication behavior configured for that server entry. Three details determine whether the attempt succeeds:
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config.php, delegate authentication to HTTP, or use SASL. - Identifier: the login may be matched as a full DN or searched through an attribute such as
uid. - Directory context and permissions: the account must exist in the selected tree and be allowed to bind with the supplied password.
Consequently, a password that works for one LDAP database can fail in another, and an account that administers the regular directory suffix may have no authority over cn=config.
Check the authentication mode before changing credentials
Open the active phpLDAPadmin config.php and find the server entry displayed on the login page. Check its login/auth_type value. The project configuration example lists five modes:
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| Mode | How phpLDAPadmin obtains credentials | What to verify |
|---|---|---|
cookie |
Interactive web-form login, with credentials held in the browser session cookie. | Leave login_dn and login_pass blank in the configuration, then enter the complete DN and password on the form. |
session |
Interactive web-form login, with credentials held in the server-side session. | Use the same blank configuration fields and full-DN login approach as cookie mode. |
http |
Authentication is tied to the surrounding HTTP authentication setup. | Confirm the web server and phpLDAPadmin entry agree on the HTTP authentication arrangement; the LDAP login form alone may not control the result. |
config |
A DN and password are stored in config.php. |
Do not expect a login form. The configuration example states, “No login will be required to use phpLDAPadmin for this server.” Protect the file and verify that its static credentials are intentional. |
sasl |
Authentication uses the LDAP server’s SASL setup. | Keep login_dn and login_pass blank as documented for this mode, and check the SASL mechanism and server-side configuration. |
A common mistake is to put a username and password into login_dn and login_pass while using cookie or session. Those fields are not substitutes for the credentials entered by the person signing in. Conversely, changing an entry to config merely to bypass an error hides the problem and places a reusable password in a web-application configuration file.
Follow this troubleshooting sequence
1. Confirm that you are editing the active server entry
phpLDAPadmin can display more than one LDAP server. Match the entry in config.php to the server name, host, port, and tree shown on the login page. Edit the file actually loaded by the installation, not an unused sample or a second copy owned by another package. After changing it, reload the login page and select the intended entry again.
Record these values before making changes:
login/auth_typelogin/login_attr(the documented default isdn)login/baselogin/classserver/base, including every naming context exposed by the entrybind_idandbind_pass, if present
Keeping the original values lets you undo an experiment without accidentally changing the tree or search behavior.
2. Enter the exact DN, not the word admin
With cookie or session, start by entering the DN created by your LDAP deployment. For a directory whose suffix is dc=example,dc=org, a typical administrator DN is cn=admin,dc=example,dc=org. That is only an example; the correct suffix, common name, and capitalization depend on your deployment.
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Do not assume that admin, an email address, or a Linux login name is accepted. If login_attr remains dn, phpLDAPadmin treats the submitted value as a DN. A bare value lacks the naming-context components needed to identify the entry.
Check the DN in the LDAP directory or in the provisioning procedure that created it. Pay attention to:
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- Every relative distinguished name, such as
cn=adminoruid=directory-admin. - The complete suffix, including all
dc=components. - Whether the account is under a different organizational unit.
- Whether you are using the regular directory suffix or the configuration database.
3. Treat cn=config as a separate naming context
OpenLDAP’s dynamic configuration database is commonly rooted at cn=config. Its administrator is not necessarily the administrator of the data suffix. A Debian procedure logs in to phpLDAPadmin with cn=admin,cn=config after adding cn=config to the server base. The usual cn=admin,dc=example,dc=org account may not be able to see or modify that tree.
Autodetection of cn=config is not reliable in every installation. Add both naming contexts explicitly to the server entry’s server/base, preserving the syntax used by your installed version:
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array('cn=config','dc=example,dc=org')Select the cn=config tree in the interface, then use the administrator DN and password belonging to that tree. If you select the directory suffix while trying cn=admin,cn=config, or select cn=config while trying the suffix administrator, the credentials can be valid yet still fail in the chosen context.
4. Keep search credentials separate from login credentials
bind_id and bind_pass serve a different purpose from the credentials typed into a cookie or session login. phpLDAPadmin uses them to search for a user when anonymous search is disabled. They do not become the end user’s password and do not change which account eventually binds.
- If anonymous search is allowed, leave both fields blank as documented.
- If anonymous search is denied, set
bind_idto a service or administrator DN permitted to search the configured base, and give it the matching password inbind_pass. - Never set a nonblank
bind_idwithout its matching password; the preliminary search will fail before phpLDAPadmin can test the submitted account. - Use a search identity with the minimum read access needed to locate users. It need not be the account you want to administer the directory.
This distinction explains a common pattern: a known-good administrator password appears to fail, but the real problem is that phpLDAPadmin cannot find the administrator entry because its search bind is missing or unauthorized.
5. Verify the login attribute, base, and class filter
The documented default is login_attr='dn'. In that arrangement, a full DN is the safest input. If you changed the attribute to uid, phpLDAPadmin searches for an entry matching the submitted value, then binds as the DN returned by that search. An administrator entry created with only a cn and no uid will not be found by a uid search.
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Check the following settings together:
| Setting | Question to answer | Typical failure |
|---|---|---|
login_attr |
Is the form value interpreted as a DN or searched as an attribute? | A bare admin value is searched as uid=admin even though the entry has no uid. |
login/base |
Does the search base contain the administrator entry? | The account exists, but under another suffix or organizational unit. |
login/class |
Does the object-class filter allow the administrator entry? | The search excludes the entry before password verification. |
| Fallback-to-DN behavior | Will phpLDAPadmin try the submitted value as a DN when an attribute search finds nothing? | A root DN without the selected attribute cannot be located. |
If you intentionally use an attribute such as uid, verify that the administrator entry actually contains that attribute and that the search bind can read it. Otherwise, restore DN login or enable the documented fallback-to-DN behavior and submit the full DN.
6. Test the same bind outside phpLDAPadmin
The login source emits the message “Invalid Username or Password.” That wording does not prove that the password alone is wrong. Test the same DN and password with an LDAP client from the host running phpLDAPadmin, for example:
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This comparison separates an LDAP bind problem from a phpLDAPadmin search or configuration problem:
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- If
ldapwhoamifails with the same DN, investigate the password, account state, ACLs, TLS requirements, and server logs. - If the direct bind succeeds but phpLDAPadmin fails, inspect
auth_type, the login attribute, search base, class filter, and search bind. - If the direct bind works only with a fully qualified DN, keep
login_attrset todnor use the full DN on the form.
Review the LDAP server log at the exact time of the attempt. It can distinguish an invalid credential from an authorization denial, unavailable naming context, TLS failure, or a search that returned no entry. The generic web message cannot make those distinctions.
7. Check account state, ACLs, and transport requirements
When the DN is correct and the search finds it, a bind can still be refused by deployment policy. Check:
- LDAP access-control rules that govern the account’s ability to bind and read the required attributes.
- Account lockout, expiration, or password-history policy.
- Whether the password was changed in the same database and naming context you selected.
- Whether the server requires TLS, a particular protocol, or a trusted certificate before accepting the bind.
- Whether a proxy, load balancer, or virtual host sends phpLDAPadmin to a different LDAP server than the one tested directly.
These policies are deployment-specific; there is no universal phpLDAPadmin administrator password or ACL default to restore.
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| What you see | Most likely explanation | Next action |
|---|---|---|
The form rejects admin, but a full DN works. |
The entry uses DN login, which is the documented default. | Use the complete DN or deliberately configure an attribute search that matches the entry. |
| No form appears and the tree opens immediately. | The entry uses config authentication. |
Inspect and secure the static login_dn and login_pass; do not look for a missing login page. |
A valid password fails only after changing login_attr to uid. |
The account lacks uid, is outside login/base, or is excluded by login/class. |
Correct the search settings or return to full-DN login. |
The regular directory administrator works, but cn=config does not. |
The two naming contexts have different administrator entries and ACLs. | Add cn=config to server/base, select that tree, and use its own administrator DN. |
| Every account reports “Invalid Username or Password.” | The selected entry, authentication mode, search bind, server, or TLS setup may be wrong. | Confirm the active entry, inspect server logs, and test one account with ldapwhoami. |
| Only accounts in one organizational unit fail. | login/base or login/class excludes that branch. |
Expand the base or adjust the filter only as far as your access policy permits. |
Safe configuration checklist
Before declaring the problem fixed, verify the complete path from the browser to LDAP:
- Select the server entry that points to the intended LDAP host and port.
- Confirm whether its
auth_typeiscookie,session,http,config, orsasl. - For cookie or session mode, leave
login_dnandlogin_passblank and enter the full DN at the form. - Confirm the DN belongs to the selected naming context, especially when using
cn=config. - Ensure
login_attr,login/base, andlogin/classcan locate the entry. - If anonymous search is disabled, provide a matching
bind_idandbind_passwith search permission. - Test the exact bind independently and compare its result with the LDAP server log.
- Check ACL, password, lockout, expiration, and TLS policy when the direct bind fails.
- Remove diagnostic changes that are no longer needed and protect any file containing static credentials.
What not to change blindly
- Do not replace a DN with a short username by guesswork. The server suffix and account location are installation-specific.
- Do not switch to
configmode just to suppress the login form. It changes the security model and stores reusable credentials in the configuration. - Do not reuse the data-suffix administrator for
cn=configwithout checking its rights. Configuration and directory data are separate naming contexts. - Do not assume the web error identifies the failing stage. Search, bind, ACL, and TLS errors can all surface as “Invalid Username or Password.”
- Do not broaden search bases or ACLs permanently to make a test pass. Correct the narrow setting that prevents the intended account from being found or authorized.
The practical fix in one decision path
If you need a short operational path, use this order: identify the selected server entry; read its auth_type; if it is cookie or session, submit the complete administrator DN; if the target is cn=config, submit that context’s administrator DN instead; then verify login_attr, login/base, and login/class. When anonymous search is unavailable, configure a separate search bind. Finally, test the same DN and password with ldapwhoami and use the LDAP server log to resolve any remaining policy or transport error. This sequence fixes configuration mistakes without weakening the directory’s authentication controls.
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