RocketChat/Rocket.Chat · warning

Failed to generate unique identifier for ldap entry

Error message

Failed to generate unique identifier for ldap entry

What it means

When converting an LDAP entry, Rocket.Chat computes a unique identifier from the attributes listed in LDAP_Unique_Identifier_Field plus LDAP_User_Search_Field, falling back to 'dn'. This warning means none of those attributes — including the dn fallback — existed in the entry's raw buffer map (ldapUser._raw), so no stable unique ID could be derived and user matching for that entry is skipped.

Source

Thrown at apps/meteor/server/lib/ldap/Manager.ts:424

			userSearchField = userSearchField.replace(/\s/g, '').split(',');
		} else {
			userSearchField = [];
		}

		uniqueIdentifierField = uniqueIdentifierField.concat(userSearchField);
		if (!uniqueIdentifierField.length) {
			uniqueIdentifierField.push('dn');
		}

		const key = uniqueIdentifierField.find((field) => !_.isEmpty(ldapUser._raw[field]));
		if (key) {
			return {
				attribute: key,
				value: ldapUser._raw[key].toString('hex'),
			};
		}

		connLogger.warn('Failed to generate unique identifier for ldap entry');
		connLogger.debug(ldapUser);
	}

	private static getLdapName(ldapUser: ILDAPEntry): string | undefined {
		const nameAttributes = getLDAPConditionalSetting<string | undefined>('LDAP_Name_Field');
		return getLdapDynamicValue(ldapUser, nameAttributes);
	}

	private static getLdapExtension(ldapUser: ILDAPEntry): string | undefined {
		const extensionAttribute = settings.get<string>('LDAP_Extension_Field');
		if (!extensionAttribute) {
			return;
		}

		return getLdapString(ldapUser, extensionAttribute);
	}

	private static getLdapEmails(ldapUser: ILDAPEntry, username?: string): string[] {

View on GitHub (pinned to b2c16d5842)

Solutions

1. Check spelling of LDAP_Unique_Identifier_Field and LDAP_User_Search_Field against real attribute names — 'objectGUID' (AD) or 'entryUUID' (OpenLDAP) are the usual stable choices
2. Test the exact search with ldapsearch to confirm the configured attributes come back on the entries
3. If unsure, clear both fields so the built-in 'dn' fallback is used
4. Read the connLogger.debug(ldapUser) line right after the warning — it dumps the failing entry and shows which attributes were actually returned

Example fix

// before (Admin > LDAP)
LDAP_Unique_Identifier_Field: 'objectGUID, customld' // typo

// after
LDAP_Unique_Identifier_Field: 'objectGUID'

const configuredFields = [
  ...(settings.get<string>('LDAP_Unique_Identifier_Field')?.replace(/\s/g, '').split(',') ?? []),
  ...(getLDAPConditionalSetting<string>('LDAP_User_Search_Field')?.replace(/\s/g, '').split(',') ?? []),
  'dn',
].filter(Boolean);

const hasStableId = (entry: ILDAPEntry): boolean =>
  configuredFields.some((field) => !_.isEmpty(entry._raw?.[field]));

if (!hasStableId(ldapUser)) {
  // skip entry, alert admin: no attribute to key this user on
}

const hasRawAttribute = (entry: ILDAPEntry, field: string): entry is ILDAPEntry & { _raw: Record<string, Buffer> } =>
  Boolean(entry?._raw) && !_.isEmpty(entry._raw[field]);

When it happens

Trigger: LDAP login or data sync encounters an entry where every configured unique-id/search attribute is missing from _raw: misspelled attribute names in settings, attributes not returned by the server's search (not in the filter or attribute list), or an exotic entry (referral/root object) with no dn buffer.

Common situations: Using AD attribute names on OpenLDAP ('objectGUID' vs 'entryUUID'); attribute names with wrong casing or spaces (settings are split on ',' after stripping spaces); the directory server not returning binary attributes unless explicitly requested; custom LDAP schemas with renamed attributes.

Related errors

• Max users allowed reached, creating new LDAP users in inacti
• error-invalid-user
• error-not-authorized
• LDAP_disabled
• error-invalid-user

AI-assisted analysis of RocketChat/Rocket.Chat@b2c16d5842 (2026-08-18). Data as JSON: /api/errors/954ad049d3deb370. Report an issue: GitHub.