SAML Protocol response cannot be sent via bindings other than HTTP Post

SAML

Workbench

Connect

Published

January 29, 2026

Abstract

Resolving SAML Protocol issues on Posit Workbench and Connect

Description

You may see this error message occur when configuring SAML in Posit Workbench or Posit Connect:

SAML Protocol response cannot be sent via bindings other than HTTP Post

Some versions of our products require HTTP POST when sending the protocol response, while other versions fall back to the binding specified by the IdP.

Solution

Posit Workbench

Add the following line to the Workbench configuration file:

/etc/rstudio/rserver.conf

auth-saml-idp-post-binding=1

Then, restart the Workbench service:

Terminal

sudo rstudio-server restart

Posit Connect

Add the following line to the Connect configuration file:

/etc/rstudio-connect/rstudio-connect.gcfg

[SAML] 
IdPSingleSignOnPostBinding = true

Then, restart the Connect service:

Terminal

sudo systemctl restart rstudio-connect