What causes a proxy to become slow or stop working?

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opticalist

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What can make a proxy slow or stop working? Has anyone had this issue before? What should I check first?
 
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i usually try to separate where the problem actually is first

if every site is slow its probably the proxy/provider side. if only one site has problems then it could be that site throttling or blocking the IP

and if it gets bad only at certain hours id suspect congestion or an overloaded pool
 
opticalist said:
What can make a proxy slow or stop working? Has anyone had this issue before? What should I check first?
Click to expand...
A proxy can become slow for a number reasons but you should first isolate some circumstances. A particular site blocking your proxy can cause it to slow because it will be auto-looping to get clear traffic. Server overload is another reason. If none of this is the case, your proxy provider might be running maintenance and might need to contact HR.
 
i usually try to separate where the problem actually is first

if every site is slow its probably the proxy/provider side. if only one site has problems then it could be that site throttling or blocking the IP

and if it gets bad only at certain hours id suspect congestion or an overloaded pool
 
Check whether the IP is blacklisted or rate limited by the target site first, then test the same proxy against a plain site like ipinfo.io to see if the slowdown comes from the provider, the proxy location, or the auth/rotation settings.
 
It's usually one of two things: concurrent connection limits or the entire subnet being flagged. If you're running heavy multi-threading on scrapers, the provider's gateway will throttle you. Also, cheap shared datacenter proxies share the same C-class IPs; if someone else on your pool gets flagged by Cloudflare, your requests get blocked along with theirs.
 
Is the proxy server yours? Or are you using proxies from a provider?
In the first case, check the logs.
In the second, just accept it and buy new ones. Proxies die -after all, they are shared among many people.

Oh, and you can also check the proxies using a DNS nativeness checker. It will reveal any potential issues. Google is your friend.
 
for me it happens when i am working on high concurrency and large payloads
 
First check if it's the proxy or your setup: run a quick speed/IP check with and without the proxy, and make sure your auth details and port are still right. If it's the proxy, the usual causes are an overloaded shared IP, a rotation or reconnect happening mid-session, or bad signal and uptime on the provider's side (with mobile proxies it's often the device or SIM), so a stable dedicated IP and a provider who actually answers support messages make a big difference.
 
You have to understand that most residential proxies are actually routing your traffic through other people's computers. That means performance depends entirely on the target host's network conditions, making it completely unpredictable.
 
usually it is an overloaded proxy, bad routing, a provider issue or the target site limiting that IP. Test the proxy on a few different sites first. If it is slow everywhere, the problem is probably the proxy or provider. If it only fails on one site, the IP may be blocked or rate limited.
I would also try another IP from the same provider to see if it is just one bad endpoint
 
There are many reasons why a proxy becomes slow. Sometimes it's just the network. Other times, it's also because the proxy becomes overloaded. One thing you can test is whether the proxy becomes faster when you reduce its workload or number of active connections.
 
opticalist said:
What can make a proxy slow or stop working? Has anyone had this issue before? What should I check first?
Click to expand...

possibly due to to much traffic on the ip .
 
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