Proxy IP Connection Failure Troubleshooting Manual｜9 Frequently Asked Questions

Proxy protocol and port matching error

The 2024 proxy service compatibility test showed that the 37% connection failed from theProtocol-port combination error. The correct matching relationship is as follows:

Courtesy of ipipgoAll-Protocol Port Adaptive Technology, which automatically enables port mapping when unconventional port requests are detected.

Authentication credentials not working

utilizationcurl -v -x "http://user:pass@ip:port" https://ipinfo.ioWhen the command is verified:

• If a 407 status code is returned, it indicates a password policy conflict (e.g., special characters not URL-encoded)
• The "Proxy-Authorization" header is missing, check if the authentication method matches.

ipipgo's.Intelligent Authentication Synchronization SystemSupports automatic handling of UTF-8 encoding issues to avoid manual transcoding errors.

Insufficient IP purity triggers banning

Execute traceroute to analyze the path nodes:

3rd hop IP and proxy IP are in the same ASN → recognized as server room traffic.
TTL value deviation > 3 → protocol anomaly detection is triggered

Choose ipipgo'sResidential IP PoolIt can be ensured that the ASN attributes of each egress node are consistent with real home broadband.

Local DNS leaks cause blocking

pass (a bill or inspection etc)DNSLeakTest.comWhen testing:

• ISP information of non-proxy region appears in the result → Force proxy DNS query is required
• IPv6 address exposure → need to disable system IPv6 stacks

ipipgo's.DNS tunneling encryption technologyAll query requests can be encapsulated within the proxy channel.

Concurrent connections exceeded limit

Use the netstat command to monitor:

ESTABLISHED status connections > 50 → triggers service provider limits
TIME_WAIT status buildup > 100 → cause port exhaustion

ipipgo enterprise supportElastic Connection Pool Management, automatically keeping the optimal concurrency in the 20-40 range.

Conflicting system agent settings

Ranking Priority Order:

1. Check browser rules for plugins such as SwitchyOmega
2. Verify the status of the system-level proxy.enable configuration
3. Troubleshooting VPN residual virtual network card drivers

ipipgo client built-inEnvironmental self-testing toolsThis is a one-click fix for 92%'s configuration conflict problem.

Carrier-grade QoS restrictions

Characteristic Diagnosis:

• Evening peak hour packet loss rate surge >30%
• Specific TCP Window Size Packets Dropped

ipipgo's.Dynamic protocol masquerading techniquesTraffic characteristics can be modeled as video-on-demand patterns.

Client clock deviation too large

fulfillmentdate +%sCompare proxy server times:

Deviation > 300 seconds → SSL handshake failure
Deviation > 1800 seconds → Determined to be an anomalous node

ipipgo node built-inNTP Microstep Synchronization SystemThe error between hold and standard time is <50ms.

TCP handshake parameter mismatch

Analyze three handshakes using Wireshark:

ipipgo supportAdaptive tuning of TCP parameters, which automatically matches the target server requirements.

Troubleshooting QA

Q: What should I do if my https website shows a certificate error?
A: Using ipipgo'sIntermediate certificate preload function, certificate chain validation is done automatically on the client side.

Q: Why are IPs in some areas always unable to connect?
A: Enable ipipgo'sBGP Route Preference System, circumventing the network congestion problem at specific AS nodes.

Q: How do I maintain stability in a mobile network environment?
A: Switch to ipipgoLTE Mobile IP PoolThe NAT conversion level is reduced by direct connection to the base station.

Courtesy of the ipipgo technical team7×24 hour protocol analysis supportUsers can access TCP flow reorganization reports in real time through the console. Newly registered users can receive a free trial package with 50 diagnostic cycles.