IPSec Phase 2 Negotiation fails with "IKE protocol notification message received: received notify type NO_PROPOSAL_CHOSEN" - Authentication mismatch in Phase 2
![Pulse Secure Article: KB23221 - '13801: IKE authentication credentials are unacceptable' error message Pulse Secure Article: KB23221 - '13801: IKE authentication credentials are unacceptable' error message](https://www.pulsesecure.net/base/images/kb-images/library/CUSTOMERSERVICE/bk23221/bk23221-1.jpg)
Pulse Secure Article: KB23221 - '13801: IKE authentication credentials are unacceptable' error message
![Error 13801, IKE authentication credentials are unacceptable | Credentials, Virtual private network, Certification authority Error 13801, IKE authentication credentials are unacceptable | Credentials, Virtual private network, Certification authority](https://i.pinimg.com/736x/c6/a6/14/c6a6146b8185659bca4b3e792ce43765.jpg)
Error 13801, IKE authentication credentials are unacceptable | Credentials, Virtual private network, Certification authority
![Internet Key Exchange (IKE) and Security Association (SA) by Wentz Wu, CISSP/ISSMP/ISSAP/ISSEP,CCSP,CSSLP,CISM,PMP,CBAPWentz Wu Internet Key Exchange (IKE) and Security Association (SA) by Wentz Wu, CISSP/ISSMP/ISSAP/ISSEP,CCSP,CSSLP,CISM,PMP,CBAPWentz Wu](https://i0.wp.com/wentzwu.com/wp-content/uploads/2020/07/Top-Level-IPsec-Processing-Model_V2.jpg?ssl=1)
Internet Key Exchange (IKE) and Security Association (SA) by Wentz Wu, CISSP/ISSMP/ISSAP/ISSEP,CCSP,CSSLP,CISM,PMP,CBAPWentz Wu
Datto Networking Appliance (DNA): "IKE Authentication Credentials Are Unacceptable" Error Message When Using Client VPN
![Configuring Cisco IOS Easy VPN Remote with 802.1x Authentication [IPSec Negotiation/IKE Protocols] - Cisco Systems Configuring Cisco IOS Easy VPN Remote with 802.1x Authentication [IPSec Negotiation/IKE Protocols] - Cisco Systems](https://www.cisco.com/en/US/technologies/tk583/tk372/images/09186a008065e3be_guest-IPSec-us-Technology_White_Paper-en_2_2-1.jpg)