NAPTR lookup issue inside Docker environment

[tonytram]

Hi,

First of all I want to say thank you for your good work.

Currently, I'm encountering an issue while running this Peppol Standalone inside docker environment. I got exception of SMPDNSResolutionException failing to resolve the address.

2025-08-15 03:09:46,412 INFO [http-nio-9090-exec-1] [adbdd958-02f4-4b8b-ac4a-ad21ca52ee6f]: Trying to look up NAPTR on 'xaspi62pj5mhtmoctwvma5h7nxtovckgda3yquqzex3hc46xp46a.iso6523-actorid-upis.acc.edelivery.tech.ec.europa.eu' with 1 retries using network mode UDP_TCP 2025-08-15 03:09:46,781 WARN [http-nio-9090-exec-1] [adbdd958-02f4-4b8b-ac4a-ad21ca52ee6f]: Error looking up 'xaspi62pj5mhtmoctwvma5h7nxtovckgda3yquqzex3hc46xp46a.iso6523-actorid-upis.acc.edelivery.tech.ec.europa.eu' [4]: type not found 2025-08-15 03:09:46,782 WARN [http-nio-9090-exec-1] [adbdd958-02f4-4b8b-ac4a-ad21ca52ee6f]: No NAPTR records are provided. 2025-08-15 03:09:46,782 WARN [http-nio-9090-exec-1] [adbdd958-02f4-4b8b-ac4a-ad21ca52ee6f]: No matching DNS U-NAPTR records returned for 'xaspi62pj5mhtmoctwvma5h7nxtovckgda3yquqzex3hc46xp46a.iso6523-actorid-upis.acc.edelivery.tech.ec.europa.eu' 2025-08-15 03:09:46,784 ERROR [http-nio-9090-exec-1] [adbdd958-02f4-4b8b-ac4a-ad21ca52ee6f]: Error sending Peppol message via AS4 com.helger.smpclient.url.SMPDNSResolutionException: Failed to resolve 'xaspi62pj5mhtmoctwvma5h7nxtovckgda3yquqzex3hc46xp46a.iso6523-actorid-upis.acc.edelivery.tech.ec.europa.eu' and service 'Meta:SMP' to a DNS U-NAPTR

This is not an issue of Phase4 that I can see rather than a network containerization issue. I highly appreciated any idea how to fix it.

Thank you.

[phax]

@tonytram this has to do with the DNS server the Docker image is using, which again depends on the network mode you are using. Please check https://docs.docker.com/engine/network/#dns-services and e.g. provide a separate DNS server on the commandline