these 4 derivations will be built:
  /nix/store/bpy39bxdv9s8071szha0qc7pyjnfrsf2-etc-nix-registry.json.drv
  /nix/store/n918xf1zzd7hayhd3qmahlfghm0qknj1-etc.drv
  /nix/store/3ah28ci7lbp9phwwv20yg0ibphsl520d-activate.drv
  /nix/store/irgm8kclh8ar896ng057g333m6hrv517-nixos-system-taps-26.11.20260727.fc72407.drv
building '/nix/store/bpy39bxdv9s8071szha0qc7pyjnfrsf2-etc-nix-registry.json.drv'
building '/nix/store/n918xf1zzd7hayhd3qmahlfghm0qknj1-etc.drv'
building '/nix/store/3ah28ci7lbp9phwwv20yg0ibphsl520d-activate.drv'
building '/nix/store/irgm8kclh8ar896ng057g333m6hrv517-nixos-system-taps-26.11.20260727.fc72407.drv'
nixos-system-taps-26.11.20260727.fc72407> structuredAttrs is enabled

post-build step Route build to niks3: failed
Pushing mulatta/dots to https://niks3.mulatta.io
time=2026-09-04T21:17:35.238+09:00 level=WARN msg="Request failed, retrying" attempt=1 max_attempts=6 backoff=100ms error="Get \"https://niks3.mulatta.io/api/cache-config\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/cache-config
time=2026-09-04T21:17:35.344+09:00 level=WARN msg="Request failed, retrying" attempt=2 max_attempts=6 backoff=192.37294ms error="Get \"https://niks3.mulatta.io/api/cache-config\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/cache-config
time=2026-09-04T21:17:35.542+09:00 level=WARN msg="Request failed, retrying" attempt=3 max_attempts=6 backoff=380.227899ms error="Get \"https://niks3.mulatta.io/api/cache-config\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/cache-config
time=2026-09-04T21:17:35.927+09:00 level=WARN msg="Request failed, retrying" attempt=4 max_attempts=6 backoff=850.953268ms error="Get \"https://niks3.mulatta.io/api/cache-config\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/cache-config
time=2026-09-04T21:17:36.782+09:00 level=WARN msg="Request failed, retrying" attempt=5 max_attempts=6 backoff=1.45235141s error="Get \"https://niks3.mulatta.io/api/cache-config\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/cache-config
time=2026-09-04T21:17:38.240+09:00 level=WARN msg="Failed to fetch cache config, uploading without size limit" error="fetching cache config: sending request: request failed after retries: Get \"https://niks3.mulatta.io/api/cache-config\": dial tcp 64.176.225.253:443: connect: connection refused"
time=2026-09-04T21:17:38.287+09:00 level=WARN msg="Request failed, retrying" attempt=1 max_attempts=6 backoff=100ms error="Post \"https://niks3.mulatta.io/api/pending_closures\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/pending_closures
time=2026-09-04T21:17:38.391+09:00 level=WARN msg="Request failed, retrying" attempt=2 max_attempts=6 backoff=187.816316ms error="Post \"https://niks3.mulatta.io/api/pending_closures\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/pending_closures
time=2026-09-04T21:17:38.583+09:00 level=WARN msg="Request failed, retrying" attempt=3 max_attempts=6 backoff=427.607165ms error="Post \"https://niks3.mulatta.io/api/pending_closures\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/pending_closures
time=2026-09-04T21:17:39.016+09:00 level=WARN msg="Request failed, retrying" attempt=4 max_attempts=6 backoff=835.252316ms error="Post \"https://niks3.mulatta.io/api/pending_closures\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/pending_closures
time=2026-09-04T21:17:39.855+09:00 level=WARN msg="Request failed, retrying" attempt=5 max_attempts=6 backoff=1.477661717s error="Post \"https://niks3.mulatta.io/api/pending_closures\": dial tcp 64.176.225.253:443: connect: connection refused" url=https://niks3.mulatta.io/api/pending_closures
time=2026-09-04T21:17:41.339+09:00 level=ERROR msg="Fatal error" error="pushing paths: creating pending closures: creating pending closure: sending request: request failed after retries: Post \"https://niks3.mulatta.io/api/pending_closures\": dial tcp 64.176.225.253:443: connect: connection refused"