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

Cantor, Scott cantor.2 at
Fri Jan 15 01:13:40 UTC 2021

On 1/14/21, 8:11 PM, "users on behalf of Stephen Holland-Chang" <users-bounces at on behalf of stephen at> wrote:

>    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.

That is the most obvious risk, but how long are we talking? That is not a normal thing for an IdP to do.

>I increased the Content-Length of IIS Request Filtering to allow for larger headers and will see if that does the trick. 

Can you outline where/what setting it is so I can document it?

-- Scott

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