these 4 derivations will be built:
  /nix/store/yh74y2n8dji2gx1rq7cjmrk4myzy3if5-etc-nix-registry.json.drv
  /nix/store/c7k2752s7hjpad4q46qyksxln4xn18dd-etc.drv
  /nix/store/prwgbkk8zbk23k4qam9s351pnc1ii2bf-activate.drv
  /nix/store/738lig7xwxnjvlamzg1m5p4af9y27nmb-nixos-system-taps-26.11.20260727.fc72407.drv
building '/nix/store/yh74y2n8dji2gx1rq7cjmrk4myzy3if5-etc-nix-registry.json.drv'
building '/nix/store/c7k2752s7hjpad4q46qyksxln4xn18dd-etc.drv'
building '/nix/store/prwgbkk8zbk23k4qam9s351pnc1ii2bf-activate.drv'
building '/nix/store/738lig7xwxnjvlamzg1m5p4af9y27nmb-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=2026-09-04T22:15:11.154+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=2026-09-04T22:15:11.259+09:00 level=WARN msg="Request failed, retrying" attempt=2 max_attempts=6 backoff=190.921798ms 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=2026-09-04T22:15:11.454+09:00 level=WARN msg="Request failed, retrying" attempt=3 max_attempts=6 backoff=424.151897ms 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=2026-09-04T22:15:11.882+09:00 level=WARN msg="Request failed, retrying" attempt=4 max_attempts=6 backoff=869.702316ms 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=2026-09-04T22:15:12.757+09:00 level=WARN msg="Request failed, retrying" attempt=5 max_attempts=6 backoff=1.482013274s 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=2026-09-04T22:15:14.244+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=2026-09-04T22:15:14.291+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=2026-09-04T22:15:14.395+09:00 level=WARN msg="Request failed, retrying" attempt=2 max_attempts=6 backoff=185.516159ms 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=2026-09-04T22:15:14.585+09:00 level=WARN msg="Request failed, retrying" attempt=3 max_attempts=6 backoff=361.400131ms 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=2026-09-04T22:15:14.953+09:00 level=WARN msg="Request failed, retrying" attempt=4 max_attempts=6 backoff=857.399625ms 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=2026-09-04T22:15:15.814+09:00 level=WARN msg="Request failed, retrying" attempt=5 max_attempts=6 backoff=1.598266128s 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=2026-09-04T22:15:17.419+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"