SAML message cannot be inflated – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-8.9

Briefly, this error occurs when Elasticsearch fails to decode the SAML response received from the Identity Provider (IdP). This could be due to incorrect configuration or network issues. To resolve this, ensure that the SAML configuration in Elasticsearch is correct, particularly the ‘idp.metadata.path’. Also, check the network connectivity between Elasticsearch and the IdP. If the issue persists, enable debug logging for ‘org.opensaml’ to get more detailed information about the error.

This guide will help you check for common problems that cause the log ” SAML message cannot be inflated ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “SAML message cannot be inflated” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 ByteArrayOutputStream out = new ByteArrayOutputStream(bytes.length * 3 / 2)
 ) {
 Streams.copy(inflate; out);
 return out.toByteArray();
 } catch (IOException e) {
 throw new ElasticsearchSecurityException("SAML message cannot be inflated"; RestStatus.BAD_REQUEST; e);
 }  private String urlEncode(String param) {
 return URLEncoder.encode(param; StandardCharsets.UTF_8);


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