DNS Lookups Failing After Updating to Latest Node 20 and 18 for IBM i

Version

v20.15.1

Platform

IBM i 7.3:

OS400 idev 3 7 00780002A1F1 powerpc Os

Subsystem

DNS

What steps will reproduce the bug?

Any DNS lookup fails with connection timeout. Can run this code to reproduce:

require("dns").resolve("smtp.office365.com", function() { console.log(arguments); })

Fails with ETIMEOUT, even though the system DNS configuration is good and other software can perform DNS lookups.

How often does it reproduce? Is there a required condition?

Every time. This started happening when updating to Node 20.15.1 and Node 18.20.4 for IBM i. Everything was working fine before the update. Before, I was using Node 20.11.1 and Node 18.18.2.

What is the expected behavior? Why is that the expected behavior?

I expect a good DNS lookup, as the system DNS configuration is good and most other software can perform lookups.

What do you see instead?

ETIMEOUT on any DNS lookup.

Additional information

An interesting thing we noticed that may relate....

On the affected systems, the NSLOOKUP CL command can perform lookups with no problem, but the nslookup command in PASE fails with ETIMEOUT for any lookup.

まず、Node 20.15.1 または 18.20.4 を使用して IBM i 7.3 上で require("dns").resolve("smtp.office365.com", ... ) による問題を再現します。PASE で失敗する nslookup の動作を、正常に動作する NSLOOKUP CL コマンドおよび以前は動作していた Node バージョンと比較します。完了の条件は、影響を受けるバージョンで DNS ルックアップがタイムアウトしなくなり、回帰が適切なテストでカバーされていることです。