these 4 derivations will be built:
  /nix/store/yfciplf0fsrrmzayrhc8q7hqs2ybq892-etc-nix-registry.json.drv
  /nix/store/zg4iakm2k6hckbmf2yb91m6prgv8g25v-etc.drv
  /nix/store/0lh4s277h67wm98d4zc9kv3xksii2x6k-activate.drv
  /nix/store/knxcbdc2ns4h84qwnmdq80dhdncxz30v-nixos-system-taps-26.11.20260727.fc72407.drv
building '/nix/store/yfciplf0fsrrmzayrhc8q7hqs2ybq892-etc-nix-registry.json.drv'
building '/nix/store/zg4iakm2k6hckbmf2yb91m6prgv8g25v-etc.drv'
building '/nix/store/0lh4s277h67wm98d4zc9kv3xksii2x6k-activate.drv'
building '/nix/store/knxcbdc2ns4h84qwnmdq80dhdncxz30v-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=2026-09-04T22:20:20.490+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=2026-09-04T22:20:20.594+09:00 level=WARN msg="Request failed, retrying" attempt=2 max_attempts=6 backoff=184.851668ms 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=2026-09-04T22:20:20.783+09:00 level=WARN msg="Request failed, retrying" attempt=3 max_attempts=6 backoff=411.041924ms 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=2026-09-04T22:20:21.199+09:00 level=WARN msg="Request failed, retrying" attempt=4 max_attempts=6 backoff=860.217685ms 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=2026-09-04T22:20:22.064+09:00 level=WARN msg="Request failed, retrying" attempt=5 max_attempts=6 backoff=1.627858463s 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=2026-09-04T22:20:23.696+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=2026-09-04T22:20:23.740+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=2026-09-04T22:20:23.844+09:00 level=WARN msg="Request failed, retrying" attempt=2 max_attempts=6 backoff=180.990059ms 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=2026-09-04T22:20:24.029+09:00 level=WARN msg="Request failed, retrying" attempt=3 max_attempts=6 backoff=400.968706ms 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=2026-09-04T22:20:24.434+09:00 level=WARN msg="Request failed, retrying" attempt=4 max_attempts=6 backoff=778.004368ms 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=2026-09-04T22:20:25.217+09:00 level=WARN msg="Request failed, retrying" attempt=5 max_attempts=6 backoff=1.757383326s 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=2026-09-04T22:20:26.981+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"