Can't decode saml message from shibboleth SP - invalid byte 1 of 1-byte UTF-8 sequence

[Peter Schober]

* iljkr via users <users at shibboleth.net> [2023-02-08 16:02]:
> We have a Service Provider Shibboleth Sp v2

FYI, that software has been out of any kind of support for over 4
years now and it's probably vulnerable to several kinds of attacks.

https://shibboleth.atlassian.net/wiki/spaces/SP3/pages/2067400004/UpgradingFromV2
https://shibboleth.atlassian.net/wiki/spaces/SP3/pages/2065335693/ReleaseNotes

> where am I wrong in the decoding?

Questions about your custom SAML IDP implementation are probably best
sent to of the mailing lists for SAML development provided by OASIS:
https://www.oasis-open.org/committees/tc_home.php?wg_abbrev=security#feedback

Best,
-peter