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Support Article

NodeJS unable to connect to Redis through IPv6



In a Pega Chat, NodeJS component is unable to connect to Redis through IPv6.

From the network, telnetting to the Redis port works on IPv4 and IPv6:

[aaaaa(bbbb):/path/more_paths] host a_host
a_host has address aa.b.ccc.dd
[aaaaa(bbbb):/path/more_paths] telnet a_host a_port
Trying aa.b.ccc.dd...
Connected to a_host.
Escape character is '^]'.
telnet> quit
Connection closed.

[aaaaa(bbbb):/path/more_paths] host another_host
another_host has IPv6 address 1111:xxxx:222:yyyy::xx
[aaaaa(bbbb):/path/more_paths] telnet another_host a_port
Trying 1111:xxxx:222:yyyy::xx...
Connected to another_host.
Escape character is '^]'.
telnet> quit
Connection closed.

Error Messages

[a_host:/home/xxxxxx1] curl -I -H "Authorization:privateAPIKey 00kzq8abIzwqaHaLTPo4Aq78" http://another_host:xxx/api/chat/companyId
HTTP/1.1 402 Payment Required
Access-Control-Allow-Origin: *
Content-Type: application/json; charset=utf-8
Content-Length: 137
ETag: W/"89-a2d5378b"
set-cookie: connect.sid=s%3AMlmxk5mi55M17r2qd3-kdGPc60CWfTJf.z6BLOZAYfYSxM%2Bjv0L%2BvKsCzHv9mBLMmnw0hAG27PuM; Path=/; Expires=
Connection: keep-alive
Set-Cookieabcdefg_8080=!tX3uzWJUg66X/i5mUYuzWta7KB/GJQ1sgHa8ccOBNHcMuwFXfZ17GaTzuOEXPzg+D4Q5n4b8zln/27I7ZgEQg1Fe01wYmo4o/suB9I8c; path=/; Httponly; Secure

Steps to Reproduce

In the config.json file, configure a DNS alias which resolves to an IPv6 address.

"redis" : {
"master" : {
"host" : "a_host",
"port" : xxxx

a_host has IPv6 address 1111:xxxx:222:yyyy::xx

Root Cause

This issue was determined to be a product enhancement request.
Pega Chat 7.31.1 is not built to run on IPv6 only systems.


As a local-change, reconfigure the system to access a direct IPv6 address without Domain Name System (DNS) lookup.

An enhancement request, FDBK-26494, is created for consideration by Pega Product Management.

Suggest Edit

Published October 17, 2018 - Updated December 2, 2021

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