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This is the full output after running docker up, might give some clues

[+] Running 3/3 ⠿ Container docker-db-1 Running 0.0s ⠿ Container docker-web-1 Running 0.0s ⠿ Container docker-api-1 Recreated 60.4s Attaching to docker-api-1, docker-db-1, docker-web-1 docker-api-1 | wait-for-it.sh: waiting 720 seconds for db:3306 docker-api-1 | wait-for-it.sh: db:3306 is available after 0 seconds docker-db-1 | 2023-01-08 13:49:36 6 [Warning] Aborted connection 6 to db: 'unconnected' user: 'unauthenticated' host: '172.16.57.2' (This connection closed normally without authentication) docker-api-1 | Jan 8 13:49:37 [97] NOTICE: Starting Mempool Server... (a210a3f) docker-api-1 | Jan 8 13:49:37 [97] INFO: Restoring mempool and blocks data from disk cache docker-api-1 | Jan 8 13:49:37 [97] ERR: Electrum error: {"errno":-111,"code":"ECONNREFUSED","syscall":"connect","address":"127.0.0.1","port":50001} docker-api-1 | Jan 8 13:49:37 [97] ERR: Error connecting to Electrum Server at localhost:50001 docker-api-1 | Jan 8 13:49:37 [97] INFO: Disconnected from Electrum Server at localhost:50001 docker-api-1 | Jan 8 13:49:37 [97] INFO: Database connection established. docker-api-1 | Jan 8 13:49:37 [97] INFO: Starting statistics service docker-api-1 | Jan 8 13:49:37 [97] INFO: Starting currency rates service docker-api-1 | Jan 8 13:49:37 [97] INFO: Currency rates service will be queried over clearnet using https://price.bisq.wiz.biz/getAllMarketPrices docker-api-1 | Jan 8 13:49:37 [97] NOTICE: Mempool Server is running on port 8999 docker-api-1 | Jan 8 13:49:37 [97] INFO: Updating latest mining pools from https://raw.githubusercontent.com/mempool/mining-pools/master/pools.json over clearnet docker-api-1 | Jan 8 13:49:42 [97] WARN: runMainLoop error: connect ECONNREFUSED 127.0.0.1:8332. Retrying in 10 sec. docker-api-1 | Jan 8 13:49:47 [97] ERR: Electrum error: {"errno":-111,"code":"ECONNREFUSED","syscall":"connect","address":"127.0.0.1","port":50001} docker-api-1 | Jan 8 13:49:47 [97] ERR: Electrum error: {"errno":-111,"code":"ECONNREFUSED","syscall":"connect","address":"127.0.0.1","port":50001} docker-api-1 | Jan 8 13:49:47 [97] INFO: Disconnected from Electrum Server at localhost:50001 docker-api-1 | Jan 8 13:49:52 [97] WARN: runMainLoop error: connect ECONNREFUSED 127.0.0.1:8332. Retrying in 20 sec. docker-api-1 | Jan 8 13:49:57 [97] ERR: Electrum error: {"errno":-111,"code":"ECONNREFUSED","syscall":"connect","address":"127.0.0.1","port":50001} docker-api-1 | Jan 8 13:49:57 [97] ERR: Electrum error: {"errno":-111,"code":"ECONNREFUSED","syscall":"connect","address":"127.0.0.1","port":50001} docker-api-1 | Jan 8 13:49:57 [97] INFO: Disconnected from Electrum Server at localhost:50001

docker-api-1 | Jan 6 11:38:12 [98] ERR: Electrum error: {"errno":-111,"code":"ECONNREFUSED","syscall":"connect","address":"0.0.0.0","port":50001} docker-api-1 | Jan 6 11:38:12 [98] INFO: Disconnected from Electrum Server at 0.0.0.0:50001

My docker-compose.yml file https://pastebin.com/nn9Qy7V4

My electrumX.conf file https://pastebin.com/nGdFZJP1

docker-api-1 | Jan 6 11:38:12 [98] ERR: Electrum error: {"errno":-111,"code":"ECONNREFUSED","syscall":"connect","address":"0.0.0.0","port":50001} docker-api-1 | Jan 6 11:38:12 [98] INFO: Disconnected from Electrum Server at 0.0.0.0:50001

My docker-compose.yml file:

version: "3.7"

services:
  web:
    environment:
      FRONTEND_HTTP_PORT: "8080"
      BACKEND_MAINNET_HTTP_HOST: "api"
    image: mempool/frontend:latest
    user: "1000:1000"
    restart: always
    stop_grace_period: 1m
    command: "./wait-for db:3306 --timeout=720 -- nginx -g 'daemon off;'"
    ports:
      - 4080:8080
  api:
    environment:
      ELECTRUM_HOST: "0.0.0.0"
      ELECTRUM_PORT: "50001"
      ELECTRUM_TLS_ENABLED: "true"
      MEMPOOL_BACKEND: "electrum"
      CORE_RPC_HOST: "0.0.0.0"
      CORE_RPC_PORT: "8332"
      CORE_RPC_USERNAME: "####"
      CORE_RPC_PASSWORD: "####"
      DATABASE_ENABLED: "true"
      DATABASE_HOST: "db"
      DATABASE_DATABASE: "mempool"
      DATABASE_USERNAME: "mempool"
      DATABASE_PASSWORD: "mempool"
      STATISTICS_ENABLED: "true"
    image: mempool/backend:latest
    user: "1000:1000"
    restart: always
    stop_grace_period: 1m
    command: "./wait-for-it.sh db:3306 --timeout=720 --strict -- ./start.sh"
    volumes:
      - ./data:/backend/cache
  db:
    environment:
      MYSQL_DATABASE: "mempool"
      MYSQL_USER: "mempool"
      MYSQL_PASSWORD: "mempool"
      MYSQL_ROOT_PASSWORD: "admin"
    image: mariadb:10.5.8
    user: "1000:1000"
    restart: always
    stop_grace_period: 1m
    volumes:
      - ./mysql/data:/var/lib/mysql

My electrumX.conf file:

# default /etc/electrumx.conf for systemd

# REQUIRED
DB_DIRECTORY = /home/qbr1ck/electrumx_db
# Bitcoin Node RPC Credentials
DAEMON_URL = ####:####@localhost

COIN = Bitcoin
SERVICES = tcp://0.0.0.0:50001
PEER_DISCOVERY = off
COST_SOFT_LIMIT = 0
COST_HARD_LIMIT = 0