# 400 bad request Invalid session
**URL:** https://forum.genieacs.com/t/400-bad-request-invalid-session/642
**Category:** Uncategorized
**Created:** [March 10, 2020, 2:33pm UTC](https://forum.genieacs.com/t/400-bad-request-invalid-session/642 "2020-03-10T14:33:05Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@JulianZ](https://forum.genieacs.com/u/JulianZ)
#### Post date: [March 10, 2020, 2:33pm UTC](https://forum.genieacs.com/t/400-bad-request-invalid-session/642/1 "2020-03-10T14:33:05Z")
There is a router accesses the Internet through NAT, and then connect to the ACS,
ACS responded “400 bad request”, as the log shows
where is the problem? What could I do to fix this?
Please help me ！
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### Author:  [@bajojoba](https://forum.genieacs.com/u/bajojoba)
#### Post date: [March 13, 2020, 9:22pm UTC](https://forum.genieacs.com/t/400-bad-request-invalid-session/642/2 "2020-03-13T21:22:47Z")
Invalid session would mean that the cooike value is not correct. If you look closely when server make GPV it doesn’t use any cookie, however when your device replys in header you can see cookie. Either there is some proxy or relay in your path which sets the cookie.
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### Author:  [@westspeed](https://forum.genieacs.com/u/westspeed)
#### Post date: [August 16, 2021, 9:02am UTC](https://forum.genieacs.com/t/400-bad-request-invalid-session/642/3 "2021-08-16T09:02:55Z")
do you know how to solve this cookie problem?
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### Author:  [@bajojoba](https://forum.genieacs.com/u/bajojoba)
#### Post date: [September 7, 2021, 1:03pm UTC](https://forum.genieacs.com/t/400-bad-request-invalid-session/642/4 "2021-09-07T13:03:50Z")
Yes. The problem was with load balancer (haproxy) I had to use sticky table and now it runs great.