"Proxy Server Not Responding Error in Windows 10/11: 6 Causes and Quick Fix"

Are you managing 20 Facebook Ads accounts in AdsPower and suddenly see a white screen with the message "Proxy Server Not Responding"? Or has the Wildberries scraper suddenly stopped fetching prices, and Windows is reporting a connection error? This is one of the most common issues for those who work with proxies every day. We analyze 6 real reasons for the failure and specific steps to restore internet access in 5-15 minutes without reinstalling the system.

What Does the "Proxy Server Not Responding" Error Mean

Windows displays this message when the system or browser attempts to send a request through the specified proxy address but does not receive a response within the set timeout. Simply put: the computer is trying to connect to the IP:port, but either no one is responding, or the response comes back with an access error. For an average user, this is a one-time inconvenience, but for an arbitrage specialist driving traffic to Facebook Ads or TikTok Ads, it means campaign stoppage and wasted budget.

It is important to understand that the error occurs at three levels — system (Windows settings), network (the proxy server itself and the provider), and application (the browser or anti-detect system running the profile). To quickly find the cause, you need to check them in order, without jumping straight to reinstalling network drivers, as often advised in general guides.

Reason 1: Incorrect Proxy Settings in Windows

The most basic reason is a typo in the address or port in the system settings. If you are working directly through Windows (without an anti-detect browser), go to Settings → Network & Internet → Proxy and check the field manually. Common mistakes include:

• The HTTP protocol is specified instead of SOCKS5 (or vice versa) — many residential proxies only work with a specific protocol;
• A space or extra character was accidentally left in the address when copying from a password table;
• The port is duplicated twice through a colon (e.g., 1.2.3.4:8080:8080);
• The "Automatically detect settings" option is enabled, which conflicts with manual settings.

If you manage multiple accounts and manually enter proxies in the system — this is already risky, as all programs on the computer start using the same IP simultaneously. For multi-accounting, it is better to use a separate proxy for each profile in the anti-detect browser, rather than global Windows settings.

Reason 2: Proxy is Disabled, Overloaded, or Expired

If the address and port are entered correctly, but there is still no response — the problem may be on the server side. Free and cheap proxy lists often "go down" without warning: the server is physically turned off, the limit of simultaneous connections is exceeded, or the paid rental period for the IP has expired.

For residential and mobile proxies with rotation, there is another nuance: if the traffic limit on the plan is exhausted, the server does not issue a clear "access denied" error but simply stops responding — this is what Windows interprets as "proxy server not responding." You can easily check this: log into your provider's personal account and check the traffic usage statistics and the status of active ports.

Also, check if the number of simultaneous sessions on one IP has been exceeded — if you are running 30 profiles in Dolphin Anty through the same proxy without rotation, the server may simply not cope with the load and drop connections.

Reason 3: Antivirus and Firewall Blocking the Connection

Windows Defender, Kaspersky, Avast, and other security programs often perceive traffic through a non-standard proxy port as suspicious activity and block it at the firewall level. This happens especially often after an antivirus or Windows system update, when the firewall rules are reset to default values.

You can easily check this hypothesis: temporarily disable the antivirus and Windows firewall (for 2-3 minutes, no longer) and try to reopen the page through the proxy. If the internet appears — you need to add the used port and proxy address, as well as the exe file of the anti-detect browser to the exceptions list of the defender, rather than disabling the antivirus permanently.

Reason 4: Conflict in Anti-Detect Browser

If the error appears not in the system but specifically in the Dolphin Anty profile, AdsPower, Multilogin, GoLogin, or Octo Browser — the cause is almost always local to that profile. Let's analyze typical scenarios:

• Incorrect proxy string format. Each anti-detect browser requires its input format — somewhere it is login:password@ip:port, elsewhere it is separate fields. If you copy the data in the wrong format, the system will either throw an error immediately or skip the profile, but the connection will not work;
• Profile created under an old proxy. If you changed the proxy provider but forgot to update the data in the already created browser profile — this is where the error comes from;
• Incompatibility of proxy type with the browser engine. Some versions of anti-detect browsers on older Chromium builds work worse with SOCKS5 and require HTTP(S);
• Profile cache is corrupted. Sometimes simply recreating the profile with the same proxy data helps — the old cookie cache of the browser engine may conflict with the new connection.

If you manage client accounts in an SMM agency, we recommend keeping a table of correspondence "profile - proxy - last check date," so that in case of a mass error, you can quickly understand which IPs dropped simultaneously, rather than checking each profile manually.

Reason 5: Target Site Blocked Your IP

Sometimes the problem is not with Windows or the proxy server technically — Facebook, Instagram, TikTok, or Wildberries may have already blacklisted a specific IP for suspicious activity (too many requests, multiple logins, signs of a bot). In this case, the browser may interpret constant connection drops as "proxy not responding," even though the proxy server is functioning correctly; the target site is simply cutting off all traffic from that address.

You can easily check this: try accessing a neutral site (for example, an IP locator) through the same proxy — if the page opens normally, but a specific platform does not allow access, the issue is indeed the reputation of the IP on the target service's side. Data center proxies are most often banned by platforms for this reason, as their IP ranges are well-known to anti-fraud systems.

For tasks with high trust requirements on the platform — farming Facebook Ads, warming up Instagram accounts, working with Wildberries — it is better to use residential proxies: they appear as regular home IPs of real users and are less likely to raise suspicion with anti-fraud systems.

Reason 6: DNS and Windows Network Stack Issues

Less frequently, there is a situation where the problem is not related to the proxy at all — the system's DNS cache has become corrupted or network settings have been damaged after an improper shutdown, Windows update, or third-party VPN operation. In this case, the "proxy server not responding" error appears even with correct authentication data.

A sign of this specific reason is that the failure occurs simultaneously in several programs (both in the browser and in the scraper and messenger), not just in one profile of the anti-detect browser. This can be resolved by resetting the network stack via the command line — we will discuss specific commands in the next section.

Step-by-Step Internet Recovery Guide

To avoid randomly going through the causes, follow this sequence — it covers 90% of cases:

1. Check the proxy data. Copy the IP, port, login, and password again from your provider's personal account — without extra spaces and characters;
2. Check the proxy status with the provider. Log into your personal account and ensure that the port is active, traffic is not exhausted, and the subscription has not expired;
3. Open "Settings → Network & Internet → Proxy" and temporarily disable the "Automatically detect settings" option if you are using manual configuration;
4. Temporarily disable the antivirus and firewall for 2-3 minutes and check if the internet appears;
5. Reset the Windows network stack via the command line as an administrator:

   netsh winsock reset
   netsh int ip reset
   ipconfig /release
   ipconfig /renew
   ipconfig /flushdns

   After executing the commands, restart your computer;
6. Recreate the profile in the anti-detect browser with the same proxy data if the error is localized in one profile of Dolphin Anty, AdsPower, or GoLogin;
7. Check the IP on a neutral site — if the proxy opens regular sites but does not allow access to Facebook or Wildberries, the issue is with the IP's reputation on the platform, not with the proxy itself;
8. Change the proxy to an IP from a different subnet with the provider if the previous point is confirmed.

Quick Diagnostic Checklist

Symptom	Likely Cause	What to Do
Error in all programs at once	DNS/Windows network stack failure	Reset via netsh and ipconfig /flushdns
Error only in one browser profile	Conflict in anti-detect browser	Recreate the profile, check the proxy input format
Neutral sites open, target platform does not	IP ban on the site's side	Change IP, switch to residential proxies
Nothing opens through the proxy at all	Proxy server is down or limit is exhausted	Check the provider's personal account
Internet appears when antivirus is disabled	Firewall is blocking the proxy port	Add port and exe file to exceptions

How to Choose a Proxy to Avoid Repeating the Error

Most of the described failures are not coincidences but the result of choosing an unstable or overloaded proxy pool. If you regularly encounter connection drops while working with Facebook Ads, TikTok Ads, Instagram, or scraping Wildberries and Ozon, it is worth reconsidering the type of proxies used:

Proxy Type	When to Use	Risk of Drops
Residential Proxies	Social media farming, advertising, marketplaces	Low
Mobile Proxies	TikTok Ads, Instagram, bypassing strict anti-fraud systems	Very low
Data Center Proxies	Scraping, tasks without strict anti-fraud checks	Medium-high on closed platforms

Additionally, pay attention to three parameters with the provider: server uptime (should be no less than 99%), limit of simultaneous connections on one port, and the presence of technical support that can quickly confirm whether a specific IP is live. This saves hours of diagnostics when the "proxy server not responding" error pops up in the middle of the workday.

Conclusion

The "Proxy Server Not Responding" error in Windows almost never requires a system reinstall — in 9 out of 10 cases, the cause lies in incorrect connection data, an overloaded proxy server, antivirus blocking, or IP bans on the target platform's side. Go through the checklist from the article: check the data, reset the network stack, temporarily disable the firewall, and ensure that the proxy is indeed live with the provider.

If drops occur regularly specifically when working with Facebook Ads, Instagram, or Wildberries — this is a signal to change the type of proxy, rather than endlessly fixing Windows. For account farming and advertising campaigns, residential proxies with real home IPs are better suited, while for mobile traffic and strict anti-fraud systems — mobile proxies are less likely to get blocked and less likely to give the "proxy server not responding" error at the most inconvenient moment.