> Source: [sk182705](https://support.checkpoint.com/results/sk/sk182705)

# sk182705 - Authentication with Dynamic ID fails with "DynamicID sending failure" error message 

| Property | Value |
|----------|-------|
| Solution ID | sk182705 |
| Date Created | 2024-10-09 |
| Last Modified | 2026-04-02 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20, R81.10 (EOS), R81 (EOS) |
| OS | Gaia |

## Symptoms

- * Endpoint VPN users cannot authenticate using Dynamic ID as the second factor and receive error message `"DynamicID sending failure. To retry, please type r and select Submit."`  

* The `$FWDIR/log/vpnd.elg` or `$FWDIR/log/iked.elg` logs shows:   

  `[AU] s_handleSenderResponse: DynamicIDSession (75666438) state 100 rc_code - -3`  
  `[AU] DynamicIDSession::setState new_state -103 client_code 60 server_code 0 log_msg SSL certificate problem: unable to get local issuer certificate`  
  `[AU] .--> DynamicIDManager::handleServerResponse`  
  `[AU] DynamicIDManager::handleServerResponse: trigger callback`  
  `[AU] dynamic_id_manager_callback state: -103 `  
  `[AU] dynamic_id_manager_callback(au=75593620): ePRIVATE_DID_SENDING_ERROR `  
  `[CPSC] cpsc_get_msg_by_id: Cache HIT for CPSC_DID_SENDING_ERROR`  
  `[MSGOBJ] msg_obj_init: msg_obj: OK`  
  `[AU] call_io_func(au=75593620): prompt sent`  
  `[AUTHENTICATION_MANAGER] AuthenticationManager::makeAuIoFunc: result = DynamicID sending failure. To retry, please type r and select Submit.`
* Pcap capture on the Security Gateway for the IP address of the Security Management/Email Server shows `"Unknown CA"` after Security Management/Email Server sends "Server Hello".

## Cause

The Security Gateway cannot verify the Certificate Authority that was used to sign the certificate presented by the Short Message Service (SMS)/Email Server during the SSL handshake.

## Solution

This solution requires authentication. Please log in to view the full solution.

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