- 1 year ago
GetAddrInfo (C++) on Windows not handling IPv6 correctly, returning error code 11004 for domains that resolve fine through other means
If you're experiencing issues with getaddrinfo
in C++ on Windows not handling IPv6 correctly and returning error code 11004 (WSANO_DATA), which indicates that the requested name is valid but does not have an IP address, there could be a few possible causes and solutions:
Check DNS Configuration: Ensure that your DNS configuration is correct and up to date. Verify that your network settings are configured to use IPv6 DNS servers properly. You can also try flushing your DNS cache by running the command
ipconfig /flushdns
in a command prompt with administrative privileges.Disable IPv6 Teredo Tunnels: Some Windows systems may have IPv6 Teredo tunnels enabled, which can interfere with IPv6 resolution. You can try disabling Teredo by running the following command in a command prompt with administrative privileges:
netsh interface teredo set state disable
.Use AI_ADDRCONFIG Flag: When calling
getaddrinfo
, pass theAI_ADDRCONFIG
flag as a hint to retrieve only addresses that are configured on the local system. This flag ensures that only IPv6 addresses that are actually configured on the system are returned. Example:cppaddrinfo hints{};
hints.ai_family = AF_UNSPEC; // Allow both IPv4 and IPv6
hints.ai_socktype = SOCK_STREAM; // Specify socket type
hints.ai_flags = AI_ADDRCONFIG; // Only return addresses configured on the local system
addrinfo* result;
int status = getaddrinfo("example.com", "http", &hints, &result);
if (status == 0) {
// Address resolution succeeded
// Process the result
} else {
// Address resolution failed
// Check the error code and handle the error
}
Update Winsock: Ensure that your system has the latest updates for Winsock (Windows Sockets) to address any potential bugs or compatibility issues. You can check for updates using Windows Update or download the latest Winsock update from the Microsoft website.
Consider Compatibility with the Network Environment: In some cases, the issue may be related to your network environment, such as firewalls or proxy configurations. Ensure that your network settings are correctly configured and compatible with IPv6.
If the issue persists after trying these solutions, you may need to perform further troubleshooting or seek assistance from a network administrator or Windows system expert to diagnose and resolve the specific cause of the IPv6 resolution problem on your Windows system.