Find out why Dolphin{anty} cannot connect to your proxy and fix it in order.
| Item | What it means | How to tell |
|---|---|---|
| 1. Your computer cannot reach the proxy | Your network, firewall, VPN or system proxy blocks the connection to the proxy address | curl from the same computer fails or times out |
| 2. The proxy does not answer | Wrong host, port or protocol, or the IP has expired or its login is wrong | curl fails from every network you try |
| 3. The checker cannot reach it from where it runs | The proxy works from your computer but the app's check fails | An outside checker or curl passes while Dolphin{anty} shows the error |
The three causes follow the Dolphin{anty} article read on 13 November 2026; the "How to tell" column is ours.
Dolphin{anty} accepts IP:PORT:LOGIN:PASSWORD. Paste the whole string in one go, with no spaces or line breaks at the end.
Expected result The app splits it into host, port, login and password.
The proxy type in the app must match the port. For Proxy302, HTTP uses port 2222 and SOCKS5 uses port 3333.
Before continuing Choosing SOCKS5 for an HTTP asset (or the reverse) is a common reason for a failed check.
Run the curl commands below on the same computer.
Expected result The answer shows the exit IP and country.
Switch network (for example a phone hotspot), turn off any VPN or system proxy, then check again. The app's checker can fail where your own computer succeeds.
Recheck login and password, the lease end date in My assets, and any IP allowlist. Re-copy the values instead of typing them.
# HTTP
curl -x http://LOGIN:PASSWORD@HOST:PORT https://ipinfo.io/json
# SOCKS5
curl -x socks5h://LOGIN:PASSWORD@HOST:PORT https://ipinfo.io/jsonExample only: replace LOGIN, PASSWORD, HOST and PORT with your own values.
Check The route from the app's checker to the proxy, or a local VPN or system proxy.
Fix Change network, disable VPN, retry; add the proxy again from a fresh paste.
Stop when If it only works on another network, the first network blocks the proxy port.
Check Host, port and your firewall.
Fix Check HOST and PORT against My assets and test from another network.
Stop when If it fails everywhere, open a Support ticket with the order number.
Check Login and password, copied without spaces.
Fix Re-copy USERNAME and PASSWORD from My assets.
Check Time zone and language of the profile against the exit country.
Fix Align them, then run an IP purity check.
Buy a static residential IP (US$0.50 for 1 day, US$7.99 for 30 days).
In My assets copy HOST, PORT, USERNAME and PASSWORD and build HOST:PORT:USERNAME:PASSWORD. Pick HTTP for port 2222 or SOCKS5 for port 3333 to match the asset.
Run the proxy check in the app. If it fails, run the curl test and follow the table above.
The built-in check could not get through. The article lists three causes: your network cannot reach the proxy, the proxy does not respond, or the checker cannot connect from where it runs.
IP:PORT:LOGIN:PASSWORD, and it supports HTTP, SOCKS5 and SSH.
The article says the problem is then the route between the checker and the proxy. Change network, disable VPN or system proxy, and retry.
HTTP uses 2222 and SOCKS5 uses 3333 on proxy.proxy302.com. Each static IP asset is issued with one protocol, so match the type in the app to it.
Not at first. Fix format, protocol, port and network; a lease that has ended or credentials that no longer match are the other cases.
Add a Proxy302 proxy in Dolphin {anty}: click New proxy in a profile, pick the protocol, paste one line and check it with the arrows.
Fix a Dolphin{anty} proxy error by re-copying the proxy, matching protocol and port, trying another network and testing the proxy elsewhere.
The ERR_PROXY_CONNECTION_FAILED error appears in Chrome and Edge when the browser cannot establish a connection with a proxy server.
Every working proxy is described by five basic fields: protocol, host address, port, login, and password.
Fixed static ISP proxies: a residential-grade IP that stays the same for the whole term. For social accounts, stores and AI tools. HTTP and SOCKS5.
View options and pricingOfficial documentation · Confirmed on:
Read on 13 November 2026: Dolphin{anty} accepts proxies in the IP:PORT:LOGIN:PASSWORD format and supports HTTP, SOCKS5 and SSH; a failed built-in check shows a red Error status with "Error checking connection to proxy"; the listed causes are that your network cannot reach the proxy, the proxy is not responding, or the checker cannot connect from where it runs; if an external checker passes but Dolphin{anty} fails the problem is the route between the checker and the proxy, and if both fail check credentials, the IP allowlist and plan status.
The exact wording "failed to establish proxy connection" was not confirmed on an official page we could open; messages vary by version.
Product observation · Confirmed on:
Product facts file of the site, checked 13 November 2026: HTTP port 2222 and SOCKS5 port 3333 on proxy.proxy302.com; each static IP asset is issued with one protocol; static IP prices from US$0.50 a day.
Create an account, top up once, then pick rotating residential, static ISP or datacenter IPs and have one running in your browser within minutes.
