Using basic authentication is not working since 5.0.2

[amitripshtos]

Since 5.0.2, when I'm using basic authentication with kibana - I get this error:

The user name and password are correct , and indeed with 5.0.1 everything is working fine..

Kibana version: 5.0.2 / 5.1.1

Elasticsearch version: 5.0.1 / 5.1.1

Server OS version:

Browser version: Chrome 55

Browser OS version:

Original install method (e.g. download page, yum, from source, etc.):

Description of the problem including expected versus actual behavior:

Steps to reproduce:

1. Start a kibana that protected by basic authentication (elasticsearch.username/password)
2. Try to access it - you will get internal server error log in browser

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):
{"type":"error","@timestamp":"2016-12-11T08:17:09Z","tags":[],"pid":11,"level":"error","message":"Authentication Exception","error":{"message":"Authentication Exception","name":"Error","stack":"Error: Authentication Exception\n at respond (/usr/share/kibana/node_modules/elasticsearch/src/lib/transport.js:289:15)\n at checkRespForFailure (/usr/share/kibana/node_modules/elasticsearch/src/lib/transport.js:248:7)\n at HttpConnector. (/usr/share/kibana/node_modules/elasticsearch/src/lib/connectors/http.js:164:7)\n at IncomingMessage.wrapper (/usr/share/kibana/node_modules/elasticsearch/node_modules/lodash/lodash.js:4994:19)\n at emitNone (events.js:91:20)\n at IncomingMessage.emit (events.js:185:7)\n at endReadableNT (_stream_readable.js:974:12)\n at _combinedTickCallback (internal/process/next_tick.js:74:11)\n at process._tickDomainCallback (internal/process/next_tick.js:122:9)"},"url":{"protocol":null,"slashes":null,"auth":null,"host":null,"port":null,"hostname":null,"hash":null,"search":"","query":{},"pathname":"/app/kibana","path":"/app/kibana","href":"/app/kibana"}}