The VPN client fails before the connection is established.
Probable causes
- Identifiers or MFA refused
- Certificate expired
- Incorrect portal address
- Filtered VPN port
- Fire-side or operator
Verifications.
- Check the correct error — Remove the VPN client’s message.
- Test the name of the portal – Solve the VPN FQDN.
- Test port — Control the connectivity of the TTC/UDP according to the technology.
- Testing another network — A mobile connection sharing can allow to, remove local filtering.
- Check VPN logs — Check out the events on the evaporator side.
Solutions…
- Correct the authentication or MFA
- Renew an expired certificate
- Correct DNS or portal
- Analyze the system if all users are affected