What is Windows Error 13859 (ERROR_IPSEC_IKE_OUT_OF_MEMORY)?

Error 13859 (ERROR_IPSEC_IKE_OUT_OF_MEMORY) is a Windows Internet & WinHTTP error that occurs when memory allocation failed.. This guide provides step-by-step solutions to resolve this issue.

What causes Error 13859?

A running application has a memory leak consuming all available RAM. The system page file (virtual memory) is too small or disabled. Too many applications are running simultaneously. A driver is consuming excessive kernel memory (nonpaged pool)

How do I fix Error 13859 (ERROR_IPSEC_IKE_OUT_OF_MEMORY)?

Increase Virtual Memory (Page File): Press Win+R, type sysdm.cpl, press Enter. Go to Advanced tab → Performance Settings → Advanced → Virtual Memory → Change. Uncheck 'Automatically manage paging file size'. Select your system drive, choose 'Custom size'. Set Initial size to 1.5x your RAM, Maximum to 3x your RAM (e.g., 12288 / 24576 for 8GB RAM). Click Set → OK → Restart your computer

Fix ERROR_IPSEC_IKE_OUT_OF_MEMORY — Windows Error Code 13859

🎮 Common Scenario: Are you experiencing Error 13859 while launching or installing Roblox? The solutions below directly address the system interactions specific to this application.

⚡ Quick Fix

Increase Virtual Memory (Page File): Press Win+R, type sysdm.cpl, press Enter

👇 See all 3 solutions below

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📑 Table of Contents

What is Error 13859? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error 13859?

Windows System Error Code 13859, known as ERROR_IPSEC_IKE_OUT_OF_MEMORY, is a Internet & WinHTTP error that occurs during WinHTTP, WinInet, and internet protocols. The error indicates that: Memory allocation failed. When this error is encountered, the Windows operating system was unable to complete the requested operation within the internet services subsystem. The error code 13859 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name ERROR_IPSEC_IKE_OUT_OF_MEMORY maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within WinHTTP, WinInet, and internet protocols is essential for effective troubleshooting.

⚠️ Common Causes

A running application has a memory leak consuming all available RAM
The system page file (virtual memory) is too small or disabled
Too many applications are running simultaneously
A driver is consuming excessive kernel memory (nonpaged pool)

✅ Step-by-Step Solutions

1 Increase Virtual Memory (Page File)

Press Win+R, type sysdm.cpl, press Enter
Go to Advanced tab → Performance Settings → Advanced → Virtual Memory → Change
Uncheck 'Automatically manage paging file size'
Select your system drive, choose 'Custom size'
Set Initial size to 1.5x your RAM, Maximum to 3x your RAM (e.g., 12288 / 24576 for 8GB RAM)
Click Set → OK → Restart your computer

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Show Advanced Solutions (2 more)

2 Identify Memory-Hungry Processes

Press Ctrl+Shift+Esc to open Task Manager
Click 'More details' if needed, then sort by Memory column
Identify processes using excessive memory (>1GB is suspicious)
Right-click the process → End Task (save your work first)
If a process consistently leaks memory, check for updates or reinstall it

3 Check for Memory Leaks with RAMMap

Download RAMMap from Microsoft Sysinternals (free tool)
Run RAMMap and check the 'Use Counts' page for unusually large allocations
If 'Nonpaged Pool' is very large, a driver has a memory leak
Run: poolmon.exe to identify which driver tag is consuming pool memory
Update or uninstall the offending driver

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💻 Diagnostic Command

Run this PowerShell command to find related events in your system log:

Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*13859*" -or $_.Message -like "*ERROR_IPSEC_IKE_OUT_OF_MEMORY*"} | Format-List

💡 Open PowerShell as Administrator, paste the command above, and press Enter.

🛡️ Prevention Tips

Monitor memory usage with Task Manager and set alerts for >85% usage
Keep your page file on an SSD for faster virtual memory performance
Close unused browser tabs and applications before running heavy software

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Last updated: 2026-03-13

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Based on Official Microsoft Documentation

Solutions Tested on Windows 10 & 11

Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-13.