Connection to server failed means your device cannot reach the server it is trying to connect to. The connection either times out or is refused before it completes. It shows up in email, business apps, websites and VPNs, and it is almost always caused by one of a few things: no internet, a server that is down, or a block on your device from DNS, firewall, antivirus or proxy settings. You can usually fix it yourself. The steps below go in order of likelihood, so start at the top and stop when the connection comes back. If it is a business system down or the whole office is affected, the later sections cover what to check and when calling IT support is the faster route.
What does "connection to server failed" actually mean?
A "connection to server failed" error appears when your device sends a request to a server and the connection is never completed. Your device is working and the app is open, but the two cannot establish a line between them, so the request times out or is refused instead of loading.
You will usually see one or more of these signs:
● Email that will not send or receive, or keeps asking for your password
● A business app or website that loads part way then stalls
● A VPN or remote-desktop session that drops or will not connect
● An error naming a specific server, host or IP address
The cause almost always sits in one of three places: your connection, the server itself, or a setting on your device. The next two checks tell you which one you are dealing with.
Two quick checks: is it you or the server?
Before changing any settings, run two thirty-second checks to find where the problem sits.
● Try a second device on the same network. Open the same email, app or site on your phone or another computer. If it works there, your device is the cause and the server is fine. If it fails everywhere, the issue is your connection or the server itself.
● Try a different site or service. If only one app or site fails and everything else loads, that server is the likely cause. If nothing connects at all, start with your internet or network.
These two checks tell you which half of the guide to focus on, so you are not changing settings that were never the problem.
How do you fix the "connection to server failed" error, step by step?
Work through these in order and stop as soon as the connection returns. The first few solve most cases.
1. Confirm your internet connection is live
Start here, because a dropped or weak connection is the most common cause. Open any other website or app. If nothing loads, your internet is the problem and the server is likely fine. Check that Wi-Fi is on and connected, try a wired cable if you have one, and restart your router by switching it off for thirty seconds and back on. If other sites load normally, move to the next step.
2. Check whether the server itself is down
If your internet works but one service will not connect, the server may be down. Check the provider’s status page or social media for outage notices, or paste the address into a tool like Downdetector. If the server is down, there is nothing to fix on your end and waiting is the only option. If it is up, the issue is on your device or network.
3. Restart the device
Restart your computer or phone fully. A restart clears temporary network glitches, resets the connection, and closes anything stuck in the background that may be blocking it. It is a thirty-second fix that resolves a surprising number of connection errors, so do not skip it before moving to the deeper steps.
4. Flush your DNS cache
Your device stores a DNS cache of recent address lookups. When an entry becomes outdated or corrupt, your device tries to reach the wrong location and the connection fails. Clearing the cache forces a fresh lookup.
● Windows: open Command Prompt and run ipconfig /flushdns
● Mac: open Terminal and run sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
After flushing, try the connection again. This often fixes errors that survive a restart.
5. Review your firewall and antivirus
Your firewall or antivirus can block a connection it wrongly reads as a threat, especially after an update or a new install. Temporarily disable them and test the connection. If it works, add an exception for the app or site rather than leaving your protection off. If you cannot tell which rule is causing it, that is exactly the sort of misconfiguration managed network security is set up to avoid.
6. Check your proxy settings
A wrong or leftover proxy setting routes your traffic through a server that is no longer valid, which blocks the connection. On Windows, go to Settings, Network and Internet, Proxy, and turn off any manual proxy unless your workplace requires one. On Mac, go to System Settings, Network, Details, Proxies, and do the same. If you did not set a proxy yourself, it should usually be off.
7. Verify your IP configuration
If your device has a bad IP address, it cannot route to the server. Release and renew your IP to fix it.
● Windows: in Command Prompt, run ipconfig /release then ipconfig /renew
● Mac: go to System Settings, Network, your connection, Details, TCP/IP, then click Renew DHCP Lease
If your device is set to a manual IP and you are not sure why, switching it back to automatic (DHCP) usually restores the connection.
8. Update your network drivers
Outdated or corrupt network drivers can stop your device connecting properly. On Windows, open Device Manager, expand Network adapters, right-click your adapter and choose Update driver. On Mac, driver updates come through normal system updates, so check Software Update. Restart after updating and test the connection again.
9. Test on a completely different network
If nothing above works, connect through a different network, such as a mobile hotspot, and try again. If it works on the other network, the problem is your original network or router, and your internet provider or IT support can take it from there. If it still fails, the issue is more likely the server or the specific device.
When should you stop troubleshooting and call IT support?
There is a point where carrying on costs more than the fix. For a single device with a one-off error, the steps above are enough. For a business, every minute a system is unreachable is lost work, missed orders and frustrated staff, so the maths changes fast.
Call IT support when:
● The same error keeps coming back
● It affects several people or a shared system
● Email, your server or a core app will not connect
● It appeared after a network or security change
A managed IT help desk can diagnose it remotely, often while you carry on with other work. If connection errors are becoming a pattern, a free IT audit finds the root cause so you are not fixing the same fault every few weeks.
How do you prevent connection failures?
Most connection failures are preventable with a few habits:
● Keep devices, drivers and security software updated, so known bugs are patched before they cause failures
● Document your network settings, including proxy, DNS and IP configuration, so any change is easy to trace
● Monitor your connection and servers, so problems are caught before staff notice them
For a business, this is what proactive support delivers. Fully managed IT services keep systems patched, monitored and documented in the background, so connection errors are spotted and fixed before they stop work.
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