Hrvoje,

On 7/9/25 1:04 PM, Hrvoje Lončar wrote:
This is the form:
https://thevegcat.com/suggest

13 fields are visible plus file field and few are hidden fields including
csrf token - nothing special or extreme.
Web app is published 6 years ago and all those years there was no trouble
at all.

Which exact version of Tomcat is being used?

Thanks,
-chris

On Wed, 9 Jul 2025, 16:14 Christopher Schultz, <ch...@christopherschultz.net>
wrote:

Hrvoje,

On 7/6/25 7:33 AM, Hrvoje Lončar wrote:
  > After recent Tomcat security changes, my POST request are failing
  > but not all the time. The problem is that the same request sometimes
  > ends up with an error and sometimes not.
  >
  > Tomcat is 10.0.42 protected by nginx which handles SSL certificate and
  > forwards dynamic requests to Tomcat.>
  > [snip]
  >
  > <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000"
  > redirectPort="8443" maxParameterCount="1000" maxPartCount="1000"/>

Are you anywhere near approaching your parameter limit of 1000?

Is the nginx access log showing the _csrf parameters in the URL? How
about the Tomcat log?

-chris

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