SLM XFOTA always fails

Hello,

we are trying to perform FOTA updates with default SLM application based on SDK 2.9.0,
but the application always aborts unsuccessfully.

Via AT interface the application responds:

    XFOTA.fota_stage= 0 -> Init
    XFOTA.fota_status= 1 -> Error
    XFOTA.fota_info= 2 -> Update image rejected

Via RTT-Logging there is an error "DNS lookup failed"

I have made some small overlays only to get the correct UART pins, but havent changed the application besides that.
For another nRF9160 application (not based on SLM / XFOTA commands) the FOTA update with this server is working fine.

I made a modem trace of one XFOTA attempt:

trace-2025-03-08T16-56-02.721Z.mtrace

Would appreciate any hint to get it running.

Thank you and best regards,
Bernhard

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