How to fix Uniswap connection issues? (Wallet Debug)

Troubleshooting Network Configuration

1. Verify that the selected network in your wallet matches the intended Uniswap chain — for example, Ethereum Mainnet, Polygon, or Arbitrum.

2. Confirm the RPC endpoint is active by visiting the node provider’s status page or testing with a block explorer like Etherscan or Polygonscan.

3. Manually re-add the network if custom RPC parameters appear outdated or misconfigured — include correct chain ID, block explorer URL, and currency symbol.

4. Disable any browser extensions that intercept or modify web3 requests, such as ad blockers or privacy tools interfering with injected providers.

Wallet Provider Compatibility

1. Ensure MetaMask, Trust Wallet, or Coinbase Wallet is updated to the latest stable version — older builds may lack support for newer Uniswap interface protocols.

2. Check whether your wallet uses an embedded dApp browser — some mobile wallets restrict external script execution unless explicitly permitted.

3. Avoid using multiple wallet extensions simultaneously; conflicts between injected providers can cause silent connection failures.

4. For hardware wallets like Ledger or Trezor, confirm the Ethereum app is open and the browser interface has permission to request signatures.

Browser and Cache Interference

1. Clear site-specific data for app.uniswap.org — stored session tokens or corrupted local storage may prevent proper provider initialization.

2. Launch Uniswap in an incognito window with all extensions disabled to isolate environmental variables affecting connectivity.

3. Try switching browsers — Chrome and Brave generally offer the most consistent Web3 API behavior, while Safari requires additional configuration for wallet injection.

4. Disable hardware acceleration in browser settings, as it has been observed to interfere with certain wallet pop-up rendering sequences.

Smart Contract Interaction Failures

1. Inspect pending transactions in your wallet — stuck or failed interactions may lock the provider state until manually cleared or confirmed.

2. Review gas estimation warnings on Uniswap’s interface; insufficient ETH balance for gas on non-native chains (e.g., MATIC on Polygon) leads to silent rejection.

3. Confirm token allowances are set correctly when swapping tokens requiring approval — expired or zeroed allowances break subsequent swap flows.

4. Use Etherscan’s Token Approval Checker to validate contract-level permissions before initiating swaps.

Frequently Asked Questions

Q: Why does Uniswap show “No wallet detected” even though MetaMask is installed?A: This usually occurs when the site is loaded over HTTP instead of HTTPS, or when MetaMask’s “Connect to sites when visited” toggle is disabled in its settings.

Q: Can I connect Uniswap using WalletConnect v1?A: No — Uniswap v3 and later require WalletConnect v2; legacy QR codes from v1 will fail silently during handshake initiation.

Q: My wallet connects but swaps always revert — what could be wrong?A: Reverts often stem from slippage tolerance being too low, price impact exceeding limits, or attempting to trade tokens blacklisted by Uniswap’s token list service.

Q: Does Uniswap support Ledger Live’s built-in browser?A: Not directly — Ledger Live’s internal browser does not expose a standard Web3 provider; users must use Ledger via MetaMask or direct USB connection with enabled Ethereum app.