Last Update 15.09.2026 Update – September 11, 2026: We received feedback from our partners indicating that the issue has recurred. Fortinet has confirmed the issue and provided the following response: FortiGate and other Fortinet products may experience connectivity issues with FortiGuard Anycast services due to certificate revocation (CRL) scope errors…
Last updated: 15.06.2026 In the past few days, multiple of our resellers have reported issues where DNS resolution using the default Fortinet FortiGuard DNS servers (96.45.45.45 & 96.45.46.46) is not functioning as expected with DNS over TLS (DoT) on TCP/853.
Sometimes it happens, that FortiOS is not updating it’s antivirus signatures anymore. The monitoring software, a monitoring script or a very attentive administrator is then reporting this problem to the FortiGate admin to fix it. This guide will lead you through the steps to troubleshoot this.
Some of you may have noticed that a Fortigate – configured to use the FortiGuard DNS Servers – is not resolving some DNS names anymore. Consequences can be that FQDN address objects can not be resolved or a configured mail server can not be used anymore.
For some reasons Fortigates are are not able to load the FortiGuard DDNS server list. Therefore you are not able to configure DynDNS on your Fortigate anymore. In the WebUI you will see following error message under Network > DNS > FortiGuard DDNS and you are not able to list…
Last update from 12.05.2021 at 09:40 Swiss local time: We have noticed an improvement in the situation. Some rare rating timeouts still show up from time to time, but the majority of requests are being answered correctly. Also the DNS servers are working as usual again. We have noticed an…
There seems to be a vulnerarbility in some FortiMail versions, that allow an unauthenticated remote attacker to access the system by requesting a password change. Please refer to the FortiGuard PSIRT article. The problem here is not only the unauthorized access to the system, but also the change of the…
FortiOS v6.2 has been released in March this year and we are still gaining experience with this version. In this article we would like to draw you attention to the protocol which is used for FortiGuard service communication. Up to v6.0 udp has been used, with 6.2 the default protocol…
