How to Fix Multiplayer Black Screen in How to Fish
Updated 2026-08-25
Troubleshooting guide for the black screen bug when joining or hosting multiplayer sessions in How to Fish. Fix co-op connection issues on Steam.

What causes the black screen
The multiplayer black screen bug in How to Fish typically occurs when: (1) the host and client have different game versions, (2) network ports are blocked by a firewall or router, (3) Steam overlay or Steam networking is experiencing issues, or (4) one player's save file is corrupted and fails to sync in multiplayer.
Fix 1: Verify game file versions match
Both players must be on the exact same game version. Check the version number in the main menu bottom-right corner. If they differ, both players should verify integrity of game files through Steam (Library → Right-click How to Fish → Properties → Installed Files → Verify Integrity) and restart Steam.
Fix 2: Disable firewall / port forwarding
How to Fish uses Steam's networking API, but some routers block P2P connections. Temporarily disable Windows Firewall for the game, or add an exception for How to Fish. If the issue persists, forward Steam's standard ports (27015-27050) on your router. Alternatively, try using a mobile hotspot to bypass router restrictions as a test.
Fix 3: Restart Steam and clear download cache
Steam networking issues can cause black screens. Both players should: (1) Close How to Fish completely. (2) Restart Steam. (3) Go to Steam → Settings → Downloads → Clear Download Cache. (4) Restart Steam again and relaunch the game.
Fix 4: Disable Steam Overlay and third-party overlays
Overlay conflicts can cause rendering issues in multiplayer. Disable Steam Overlay for How to Fish (Library → Right-click → Properties → General → uncheck 'Enable Steam Overlay'). Also disable Discord overlay, NVIDIA/AMD overlays, and any other third-party overlay software.
Fix 5: Host migration workaround
If only specific players get black screens when joining a particular host, try having the affected player host instead. Some network configurations are asymmetric — a player who cannot join may be able to host successfully. Use Steam's invite system rather than direct IP connections.
If nothing works
If all fixes fail, the issue may be on the server side or a known bug in the current patch. Check the Steam Community Discussions page for the game to see if other players are reporting the same issue. Report your bug to the developer through the Steam Community hub with your system specs, game version, and network setup.
How to apply this guide safely
Begin with “What causes the black screen” and compare it with the objective, inventory, and controls shown by your installed build. Do not change several variables at once. If the guide concerns progression, complete one dialogue or hand-in and confirm the objective changed before sailing away. If it concerns combat, test the control or equipment choice on an ordinary encounter before spending a boss trigger. If it concerns troubleshooting, preserve the save and start with reversible checks such as restarting the session and verifying files.
Keep a short run record with the game version, solo or co-op state, host identity, starting objective, relevant equipment, steps taken, and outcome. Physics, network state, and retail patches can make two attempts look different even when both players describe them honestly. A controlled record lets you identify which condition changed. It also gives the developer a useful reproduction if the result points to a defect rather than a missed quest step.
Evidence and version check
This article uses Steam Community — How to Fish Discussions, Steam Support — Network Troubleshooting. Official store text and developer announcements establish supported features and broad progression. Steam achievement wording establishes that a named action exists, but it does not prove an exact coordinate, probability, price, damage value, or hidden timer. Community discussions can reveal a repeated problem and possible workaround, but one reply is not treated as a universal mechanic. Where evidence stops, the guide uses cautious testing steps instead of inventing a precise answer.
Before relying on an older route, check the Steam news and discussion dates against the updated date at the top of this page. Prefer the current in-game objective when it conflicts with a video or forum post. Avoid unknown executables, replacement saves, cheats, or destructive file edits offered as shortcuts. A legitimate workaround should be explainable, reversible, and testable without surrendering account credentials or deleting the only known-good save.
Completion check
Finish with “If nothing works,” then verify the result in the system that matters: quest log for progression, inventory for items, Steam for achievements, or a repeatable symptom check for a technical fix. Do not treat a visual animation alone as proof that the save registered the event. Wait for a normal transition and inspect the state before selling items, changing hosts, or starting another objective. If the result differs from this page, send the URL, build number, exact steps, and observed result through the contact page; that evidence is how we correct guides without turning uncertain reports into false facts.
Sources & Evidence
Claims are backed by the following sources. Unknowns are marked explicitly.
- Steam Community — How to Fish DiscussionsCommunity / Tier 2-3Checked 2026-08-25
- Steam Support — Network TroubleshootingOfficial / Tier 1Checked 2026-08-25