New Member

Question

FortiGate 7.6.7: blank page on loading GUI after upgrade

Forum|Forum|23 days ago
June 29, 2026
8 replies
743 views

I've noticed an extremely strange thing upon upgrading some test FortiGates to the new version 7.6.7: the upgrade goes fine, and the FortiGate is happily online and is routing/firewalling-just fine. However, when trying to load the GUI it is just a blank page.

I can see the little favicon loading for the FortiGate login page, but its just blank otherwise. I can SSH in just fine, so that is good. I do not see any settings reset in global settings, and strangely going to the http login instead of https sometimes works (I have https redirect turned on).

As the FortiGate seems to be perfectly fine otherwise, I thought I'd see if anyone else has experienced this?

Also I have tried multiple browsers with privacy/incognito mode on, so I don't think it is a cache issue.

sjoshi

Staff

Hi @zit_kbs

Can you try

set admin-http-rate-limit-max-requests 0 & set gui-cdn-usage disable under config sys global

Thanks, Salon

N

NetRyszardAuthor

New Member

Thanks for the suggestion.

I tried both settings:

set admin-http-rate-limit-max-requests 0
set gui-cdn-usage disable

Unfortunately, they didn't resolve the issue.

The login page now appears, but after entering my credentials, I'm simply redirected back to the login page. Usually, it takes 2–4 login attempts before I'm finally able to access the GUI.

This is happening consistently on my FortiGate 60F and 40F after upgrading to FortiOS 7.6.7, and it's becoming quite frustrating.

Has anyone found another workaround or identified the root cause?

funkylicious

SuperUser

try fnsysctl killall http_authd and open the webUI in a new incognito page

"jack of all trades, master of none"

sjoshi

Staff

@NetRyszard , can you try it in new incognito page as suggested by @funkylicious

Also is this happening for all admin user?

Thanks, Salon

javisensacion

New Member

try :

config log gui-display
set resolve-apps disable
end

It is an actual bug in Forti OS 8.0, and somehow it is also on 7.6.7

N

NetRyszardAuthor

New Member

I tried the following:

config log gui-display
    set resolve-apps disable
end

Unfortunately, it did not change the behavior.

I tested it in both an Incognito window and a normal browser session. After entering my username and password, I still get a blank white page. After refreshing the page, the dashboard loads successfully.

So the initial login issue is still present, regardless of whether resolve-apps is enabled or disabled.

HarryTran

Staff

Hi @NetRyszard ,

I tried on my 40F box with basic configuration, the issue is not found. I wonder if any special config that trigger the issue when upgrading.

Could you please share me the configuration file in 7.6.6 via my official email thiep@fortinet.com?

I would try to reproduce the issue in my lab and investigate it.
Much appreciate your help.

Thanks,

Harry

N

NetRyszardAuthor

New Member

Thank you for your offer to investigate this.

Unfortunately, I cannot share the original configuration because it contains sensitive information, including VPN settings, passwords, internal IP addresses, and other customer-specific data.

Would an anonymized configuration be sufficient for your testing? If so, I can prepare one by removing or replacing all sensitive information while keeping the overall structure intact.

Please let me know if that would be acceptable.

Sop0rt3

New Member

Try changing the value of the following parameter

config system global

set admin-http-unauthenticated-request-body-timeout

The default value is 1000 milliseconds; try increasing the value.

N

NetRyszardAuthor

New Member

I tested changing the value of the following parameter:

config system global
    set admin-http-unauthenticated-request-body-timeout <higher value>
end

Unfortunately, increasing the timeout did not resolve the issue. The behavior remains the same.

RBA

Staff

Hi NetRyszard,

Looks like 1256988 shows resolved in 7.6.7. Resolved issues | FortiGate / FortiOS 7.6.7 | Fortinet Document Library

Once you login from GUI. can you check the command outputs using PUTTY

diagnose http_authd session list
diagnose sys process pidof http_authd

Unset HTTPS access from the public facing interface or enable TRUSTHOST and try to login. If issue persists, try to kill the process again 'fnsysctl killall http_authd'.

Randel07

New Member

According to Fortinet, Bug ID: 1306049
After updating to FortiOS 7.6.7, the graphical interface may display a completely blank page.
Workaround
Disable the HTTP request limiter by running:

config system global
    set admin-http-rate-limit-max-requests 0
end

But I still haven't fixed it.

Has anyone managed to fix this for a 40f?

sjoshi

Staff

Hi all,

Can you try below workaround and check if it fixes the GUI issue after upgrading to 7.6.7

config system global
set admin-http-rate-limit-max-requests 0
set gui-cdn-usage disable
set admin-http-request-header-timeout 0
set admin-http-request-body-timeout 0
set admin-http-unauthenticated-request-body-timeout 0
set gui-login-request-rate-limit 0
end

Thanks, Salon

Sign up

Login with SSO

Login to the community

Login with SSO