Multilogin proxy check failed

Last checked 2026-08-14

  • multilogin proxy check failed
  • multilogin proxy connection failed

'multilogin proxy check failed' is worded as the result of a check, not as a site that would not load - which is already the distinction that matters. A check reaches for whatever address it reaches for, and that need not be the destination you care about. So a failed check and a proxy that works for your real target are not a contradiction: they are two different requests over the same connection, and either one can fail without the other.

This page treats both directions as real. Below, one command tests a generic endpoint of the kind a check would use, and a separate command tests the site you actually use, so you can tell "the check is wrong" apart from "the proxy really is broken" before you touch the profile.

Replace USER, PASS, HOST and PORT with your own values, and replace YOUR-TARGET-SITE.example with the domain you actually need to reach. Keep the single quotes: an ampersand or a hash in a generated password will otherwise be eaten by your shell.

Five-minute checklist

1. Confirm the proxy answers before Multilogin does anything

A 200 here means there is nothing wrong with the underlying connection: right host, right port, right protocol, accepted credentials, none of it touched by Multilogin. Whatever fails from this point on is either what the check reaches for, or something else entirely inside the browser.

curl -sS -o /dev/null -w 'http_code=%{http_code}\n' --max-time 15 --proxy 'http://USER:PASS@HOST:PORT' https://example.com

2. Separate a rejected password from an unreachable proxy

A 407 on this bare request settles whether the proxy itself is listening, independent of whatever the check just concluded about either target. A timeout instead means the host or port are wrong, which no check result - pass or fail - would ever have told you on its own.

curl -sS -o /dev/null -w 'http_code=%{http_code}\n' --max-time 15 --proxy 'http://HOST:PORT' https://example.com

3. Test a generic endpoint, standing in for whatever the check reaches for

The address a check reaches for is not the site you actually want to load. This command confirms the proxy answers a plain, unrelated request of that kind, which is the thing a check would depend on.

curl -sS -o /dev/null -w 'http_code=%{http_code}\n' --max-time 15 --proxy 'http://USER:PASS@HOST:PORT' https://api.ipify.org

4. Test the site you actually need, separately from the check

Whatever the check reaches for and your real destination are two different requests over the same proxy. Either can fail without the other. Swap in the site you actually use before drawing any conclusion from the check result alone.

curl -sS -o /dev/null -w 'http_code=%{http_code}\n' --max-time 15 --proxy 'http://USER:PASS@HOST:PORT' https://YOUR-TARGET-SITE.example

5. Check whether only HTTPS traffic is blocked

Whichever of the two targets above failed, this narrows the cause to CONNECT specifically: an upstream that serves plain HTTP but refuses to tunnel HTTPS will fail the check and your real destination for the same underlying reason, regardless of which one you happened to test first.

curl -sS -o /dev/null -w 'http_code=%{http_code}\n' --max-time 15 --proxy 'http://USER:PASS@HOST:PORT' http://example.com

6. Time the connection to explain a check timeout curl doesn't reproduce

Anything that returns a verdict has to stop waiting at some point, and you do not get to see where that point is. A proxy that answers slowly can fail on that limit and still succeed when given more time by hand. This command shows where the time actually goes.

curl -sS -o /dev/null -w 'connect=%{time_connect} total=%{time_total}\n' --max-time 20 --proxy 'http://USER:PASS@HOST:PORT' https://example.com

Which side owns the problem

OwnerCauseWhat it looks like
The browser The check's result is treated as a verdict on the proxy itself A check succeeds or fails against whatever it reaches for, which is not the site you are trying to load. A failed check does not prove the proxy cannot reach your destination, and a passed check does not prove it can - the two are separate requests and deserve separate testing.
The browser More than one proxy setting applies to the same profile When two proxy settings can apply to one profile at once - a system-level proxy and a profile-level one, for instance - only one of them can be carrying traffic, and reading the settings does not tell you which one won. The check result and the configuration you are looking at can then disagree without either being wrong.
The proxy Whatever the check reaches for is blocked, your real target is not Some upstream-and-destination combinations block one host while allowing another. If a check always reaches for the same kind of address, a block on that one address reads as a general proxy failure even when your actual destination works fine.
The proxy Proxy traffic allowance exhausted 'multilogin proxy traffic' shows up as its own completion, separate from 'multilogin proxy check failed' and 'multilogin proxy connection failed' - that is enough to say traffic accounting is something people look up on its own; it is not a claim about how often it causes any particular check failure. An exhausted allowance answers TCP and still refuses to forward, which looks the same as a bad password from inside the browser.
Credential handling The same credentials active in more than one place at once When a single host:port:user:pass string is used in more than one profile or on more than one machine, the provider sees concurrent sessions from unrelated IPs and may throttle or block. This is indistinguishable from a broken proxy inside Multilogin.
Credential handling Rotated credentials still in circulation The password changed on the provider side, and whoever still has the old string keeps failing authentication with it. Every one of those attempts now reads as a check failure.

The same failure in other browsers

Vendor documentation only covers its own product. These are the phrasings the same underlying faults get in the other antidetect browsers.

BrowserHow it readsWhat differs
adspower adspower proxy connection test failed 'adspower proxy connection test failed' is worded the same way, as the result of a test rather than as a site that would not load. A single test result standing in for a diagnosis leaves you no way to see which layer failed.
gologin gologin proxy checker 'gologin proxy checker' appears as a completion of its own, so a proxy check is something people go looking for there too. Any single pass/fail verdict has the same blind spot: no indication of what was reached for, or where it failed.
dolphin-anty dolphin anty failed to establish proxy connection Phrased as a connection failure rather than a check failure, but the same underlying question applies: what did the vendor actually test, and is it the same thing you are trying to reach?

What this page cannot fix

  • An upstream IP that the destination site has already banned. That needs a different exit, and we do not sell IPs.
  • socks5 upstreams. Our first release only accepts http and https upstream proxies.
  • Bandwidth caps, concurrency limits and throttling applied on the provider side.
  • A browser fingerprint that contradicts the exit IP after a failover pool switches country. We warn about this; we do not rewrite your fingerprint.

If you hand these credentials to other people

Most of the causes above are diagnosable in one command. One is not: when the same host:port:user:pass string is in several hands, you cannot tell who is using which credential, so the same failure keeps coming back and every diagnosis starts from zero.

Proxy Bastion gives each person a separate, revocable, metered link instead of your proxy credentials. They never see the upstream address or password, and you can revoke one without rotating anything.

How it works

Sources