Electrs fails, reinstallation does not help

Electrs never worked at my umbrel. Log shows:
Caused by:
electrs_electrs_1 | 0: bitcoin p2p failed to connect: 10.21.21.20:8443
electrs_electrs_1 | 1: Connection refused (os error 111)
electrs_electrs_1 | Starting electrs 0.10.9 on aarch64 linux with Config { network: Bitcoin, db_path: “/data/db/bitcoin”, db_log_dir: None, db_parallelism: 1, daemon_auth: CookieFile(“/data/.bitcoin/.cookie”), daemon_rpc_addr: 10.21.21.20:8442, daemon_p2p_addr: 10.21.21.20:8443, electrum_rpc_addr: 0.0.0.0:50001, monitoring_addr: 127.0.0.1:4224, wait_duration: 10s, jsonrpc_timeout: 15s, index_batch_size: 10, index_lookup_limit: None, reindex_last_blocks: 0, auto_reindex: true, ignore_mempool: false, sync_once: false, skip_block_download_wait: false, disable_electrum_rpc: false, server_banner: “Umbrel Electrs (0.10.9)”, signet_magic: f9beb4d9 }
electrs_electrs_1 | [2025-03-16T06:02:35.665Z INFO electrs::metrics::metrics_impl] serving Prometheus metrics on 127.0.0.1:4224
electrs_electrs_1 | [2025-03-16T06:02:35.665Z INFO electrs::server] serving Electrum RPC on 0.0.0.0:50001
electrs_electrs_1 | [2025-03-16T06:02:36.416Z INFO electrs::db] “/data/db/bitcoin”: 645 SST files, 0.000656588 GB, 0.000000021 Grows
electrs_electrs_1 | [2025-03-16T06:02:36.600Z INFO electrs::db] closing DB at /data/db/bitcoin
electrs_electrs_1 | Error: electrs failed

What can I do? I use libre-relay, it is fully synchronised since months and working fine. Can connect directly to libre-relay with sparrow. I tried to use electrumX or Fulcrum instead of electrs - nothing works.