topic Re: DynamicID with email OTP not sending OTP in Firewall and Security Management

DynamicID with email OTP not sending OTP

chuka01 — Thu, 26 Mar 2026 12:18:46 GMT

I am configuring DynamicID as a second authentication factor for Remote Access VPN users. I have created an authentication profile, but when i try to authenticate, the email never arrives with the OTP in my mailbox. Below is an example of the smtp string format i used, and an image of my client: mail:TO=$EMAIL;SMTPSERVER=smtps://username:password@s
mtp.example.com;FROM=sslvpn@example.com;BODY=$RAWMESS
AGE.

Debugging from cvpnd.elg does not explain any errors, but i can provide the logs as needed. Thanks in advance for your help!

Re: DynamicID with email OTP not sending OTP

PhoneBoy — Fri, 27 Mar 2026 17:51:29 GMT

What is the underlying SMTP server here?

Re: DynamicID with email OTP not sending OTP

chuka01 — Mon, 30 Mar 2026 09:18:59 GMT

Hi PhoneBoy,

Apologies for the late response. The SMTP server in use is Brevo. It does not log on the server's logs, and I get an error "DynamicID sending failure,To retry, please type r and select Submit". Thanks and looking forward to your response.

Re: DynamicID with email OTP not sending OTP

PhoneBoy — Mon, 30 Mar 2026 14:57:13 GMT

Can the gateway resolve the FDQN for the SMTP server?
Can you check that the gateway can actually reach the SMTP server (e.g. with telnet/netcat in expert mode) on port 25?

Re: DynamicID with email OTP not sending OTP

chuka01 — Mon, 30 Mar 2026 15:56:27 GMT

Hi, thanks for your response. The gateway can successfully resolve the FQDN of the SMTP server over ports 587, 25 and 465. I have successfully resolved the issue. I just switched SMTP servers, and it worked. Thanks for the assistance.