Shibboleth SP3 Problem: xmltooling::IOException setHeader (Header) failed: -2147024809

Stephen Holland-Chang stephen at
Fri Jan 15 01:11:17 UTC 2021

Ah ok thanks, looking at the data closer, I believe the issue could be with the length of the attribute values as they are quite long.
I increased the Content-Length of IIS Request Filtering to allow for larger headers and will see if that does the trick. Appreciate the help and will post back if that was the issue.


Stephen Holland-Chang

> On Jan 14, 2021, at 4:49 PM, Cantor, Scott <cantor.2 at> wrote:
> On 1/14/21, 7:39 PM, "users on behalf of Stephen Holland-Chang" <users-bounces at on behalf of stephen at> wrote:
>>   What is strange about this is that looking at the DEBUG logs Shibboleth does not throw an error or anything it looks like
>> its processing everything fine.
> There's nothing wrong with that data. If the problem is IIS and the SetHeader API, that's not going to matter until a request is processed that requires attaching the header.
> -- Scott
> -- 
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