topic Constant Alarms: ERS request content-type header is out-dated in Network Access Control

Constant Alarms: ERS request content-type header is out-dated

henry.astorga — Wed, 13 May 2026 16:33:45 GMT

Hello ISE Community, I am wondering if anyone else is seeing this same alarm for "ERS request content-type header is out-dated" even though the current ISE supported RESTFul API is being used per Cisco documentation. I am currently running ISE 3.3 Patch 11 with plan to upgrade soon to 3.5.

Regards,

Henry

Re: Constant Alarms: ERS request content-type header is out-dated

Arne Bier — Thu, 14 May 2026 01:56:24 GMT

It's been there ever since I can remember, in customers with DNAC/Cat Center - I don't know if I was running an incompatible combination of ISE and Cat Center - but to my knowledge, both ISE and Cat C were at the latest version - and still you get the error - but everything works. If you have the time and patience, please open a TAC case.