WSO2 Micro Integrator “Failed to create InitialContext using factory specified in hash table” for LDAP Operation

I am trying to connect my APi developed by wso2 MI VsCode to an OpenLDAP server running on Ubuntu WSL. I’m using the WSO2 LDAP connector (V2) to perform LDAP operations (search, authentecates), but every request fails with:

LDAP operation failed: Failed to create InitialContext using factory specified in hash table.

and I cound't identify the ource of the problem

WSO2 Micro Integrator: 4.4.0 on with te connector ([https://store.wso2.com/connector/esb-connector-ldap][1])

• OpenLDAP: Running on Ubuntu 24.04 via WSL2 (IP: 172.25.32.169, Port:389)
• LDAP access from WSL: Works fine locally (tested withl dapsearch)
• Apache Directory Studio: Can connect to OpenLDAP using ldap://172.25.32.169:389

WSO2 MI LDAP connector config example:

        <ldap.searchEntry configKey="LdapConnection">
            <dn>ou=students,dc=example,dc=com</dn>
            <filters>uid=student1</filters>
            <attributes>uid,cn,mail</attributes>
            <objectClass>inetOrgPerson</objectClass>
            <scope>sub</scope>
            <limit>10</limit>
            <onlyOneReference>false</onlyOneReference>
            <allowEmptySearchResult>true</allowEmptySearchResult>
            <responseVariable>studentResult</responseVariable>
            <overwriteBody>false</overwriteBody>
        </ldap.searchEntry>

and:

        <ldap.authenticate configKey="LdapConnection">
            <dn>cn=admin,dc=example,dc=com</dn>
            <password>0000</password>
            <responseVariable>authResult</responseVariable>
            <overwriteBody>false</overwriteBody>
        </ldap.authenticate>

  <ldap.init>
    <connectionType>LDAP</connectionType>
    <secureConnection>false</secureConnection>
    <disableSSLCertificateChecking>true</disableSSLCertificateChecking>
    <providerUrl>ldap://172.25.32.169:389</providerUrl>
    <securityPrincipal>cn=admin,dc=example,dc=com</securityPrincipal>
    <securityCredentials>0000</securityCredentials>
    <timeout>30000</timeout>
    <connectionPoolingEnabled>false</connectionPoolingEnabled>
    <name>LdapConnection</name>
  </ldap.init>

my logs:

[2025-10-14 09:38:33,787]  INFO {LogMediator} - {api:LdapTestAPI POST /ldap-test/} Starting LDAP operations
[2025-10-14 09:38:33,904] ERROR {LogMediator} - {api:LdapTestAPI POST /ldap-test/} LDAP operation failed: Failed to create InitialContext using factory specified in hash table.
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << HTTP/1.1 200 OK
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << activityid: 26b76958-3b71-4ec7-a16d-400779e37914
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Accept: */*
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Access-Control-Allow-Origin: 
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Access-Control-Allow-Methods: POST
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Host: localhost:8290
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Accept-Encoding: gzip, compress, deflate, br
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Access-Control-Allow-Headers: 
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Content-Type: application/json; charset=UTF-8
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Date: Tue, 14 Oct 2025 08:38:33 GMT
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Transfer-Encoding: chunked
[2025-10-14 09:38:33,905] DEBUG {headers} - http-incoming-3 << Connection: close
[2025-10-14 09:38:33,906] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "HTTP/1.1 200 OK[\r][\n]"
[2025-10-14 09:38:33,906] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "activityid: 26b76958-3b71-4ec7-a16d-400779e37914[\r][\n]"
[2025-10-14 09:38:33,906] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Accept: */*[\r][\n]"
[2025-10-14 09:38:33,906] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Access-Control-Allow-Origin: [\r][\n]"
[2025-10-14 09:38:33,906] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Access-Control-Allow-Methods: POST[\r][\n]"
[2025-10-14 09:38:33,906] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Host: localhost:8290[\r][\n]"
[2025-10-14 09:38:33,906] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Accept-Encoding: gzip, compress, deflate, br[\r][\n]"
[2025-10-14 09:38:33,906] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Access-Control-Allow-Headers: [\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Content-Type: application/json; charset=UTF-8[\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Date: Tue, 14 Oct 2025 08:38:33 GMT[\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Transfer-Encoding: chunked[\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "Connection: close[\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "[\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "bd[\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "{[\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "                        "error": "LDAP operation failed",[\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "                        "message": "Failed to create InitialContext using factory specified in hash table."[\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "                    }[\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "0[\r][\n]"
[2025-10-14 09:38:33,907] DEBUG {wire} - HTTP-Listener I/O dispatcher-2 << "[\r][\n]"


[1]: https://store.wso2.com/connector/esb-connector-ldap