[Bug 60513] New: wininet: TCP keep-alive probe configuration and idle socket eviction across cellular CGNAT gateways

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60513

            Bug ID: 60513
           Summary: wininet: TCP keep-alive probe configuration and idle
                    socket eviction across cellular CGNAT gateways
           Product: Wine
           Version: 10.0
          Hardware: x86-64
               URL: https://pxm2.io/mobile-proxies/4g-vs-5g-mobile-proxies
                    /
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wininet
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---
      Distribution: ---

When running Windows applications under Wine that perform persistent HTTP/S
requests via WinINet or WinHTTP across mobile broadband WAN adapters (4G LTE /
5G USB cellular modems), pooled idle TCP connections frequently fail with
ERROR_INTERNET_CONNECTION_RESET (12031) or ERROR_INTERNET_TIMEOUT (12002).

Under RFC 6598 (Carrier-Grade NAT IPv4 Address Space) and mobile carrier
network architectures, cellular middleboxes enforce strict translation session
timeouts (often 30 to 60 seconds of inactivity). Standard Windows registry
settings for KeepAliveTimeout (defaulting to 120s) exceed mobile carrier CGNAT
session eviction windows. When WinINet reuses an evicted socket from its
connection pool without an active keepalive probe having been acknowledged, the
carrier gateway drops the outbound packet or returns a TCP RST.

Configuring INTERNET_OPTION_SEND_TIMEOUT and setting SO_KEEPALIVE intervals
below 30s prevents silent socket disconnection across cellular LTE/5G carrier
pools.

Technical references & network benchmarks:
- Cellular 4G vs 5G modem throughput and TCP socket behavior benchmarks:
https://pxm2.io/mobile-proxies/4g-vs-5g-mobile-proxies/
- Microsoft WinINet connection pooling documentation:
https://learn.microsoft.com/en-us/windows/win32/wininet/managing-connection-...
- IETF RFC 6598 (IANA-Reserved IPv4 Prefix for Shared Address Space):
https://datatracker.ietf.org/doc/html/rfc6598
- IETF RFC 7230 (HTTP/1.1 Message Syntax and Routing):
https://datatracker.ietf.org/doc/html/rfc7230

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[Bug 60513] wininet: TCP keep-alive probe configuration and idle socket eviction across cellular CGNAT gateways

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60513

Nikolay Sivov <[e-mail]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                URL|https://pxm2.io/mobile-prox |
                   |ies/4g-vs-5g-mobile-proxies |
                   |/                           |

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