Synchronet v3.21e-Win32 (install) has been released (Mar-2026).

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faq:nix [2022/05/07 09:27] – Fixed broken anchor link. Cleaned up the entry a bit and clarified how the limits work. Andrefaq:nix [2023/02/08 23:50] (current) – [Maximum Open Files] Replace pgrep with pidof digital man
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 **Question:**\\ **Question:**\\
 Why am I seeing ''ERROR 24 (Too many open files)'' failures in my error log? Why am I seeing ''ERROR 24 (Too many open files)'' failures in my error log?
 +
 +**Answer:**\\
 +Versions of Synchronet prior to v3.19c contained a bug with the JavaScript //User// class that could cause a leak of open file descriptors (concurrent opens of the ''[[dir:data]]/user.dat'' file that were never closed). This bug, combined with a long-running //webv4// ''events.ssjs'' issue that could cause a lot of instances of the //User// class to linger in the JavaScript heap (since fixed with a call to ''js.gc()''), could cause "Too many open files" errors to occur.
  
 **Answer:**\\ **Answer:**\\
 You need to increase your maximum number of open files. You need to increase your maximum number of open files.
 +\\ \\
 +**Checking current open file limits**\\
 +The most reliable way to determine your open file limit is to login to your BBS as a sysop, run the '';SHELL'' [[module:str_cmds|string command]], and at the OS command line, issue the commands below. The hard limit is the systemwide limit, and the soft limit is one that a user can raise (up to the hard limit).
  
-To determine your open file limit, when logged in as the user Synchronet runs as, use the commands below. The hard limit is the systemwide limit, and the soft limit is a soft limit that a user can raise (up to the hard limit).+To view the soft limit: ''ulimit -Sn''\\ 
 +To view the hard limit: ''ulimit -Hn''
  
-Soft limit: ''ulimit -Sn''\\ +Another method that works on Linux is to search for line beginning with "Max open files" in the file ''/proc/$(pidof sbbs)/limits'': 
-Hard limit: ''ulimit -Hn''+  $ sudo grep "Max open files" /proc/$(pidof sbbs)/limits 
 +  Max open files            10000                10000                files     
  
-To alleviate the ERROR 24 problem on Linux, edit ''/etc/security/limits.conf'' to add the lines below.+**If you start Synchronet with systemd**\\ 
 +If you're using [[howto:systemd|systemd]] to start sbbs, edit your service file (usually ''sbbs.service'') by adding the following line in the ''[Service]'' section:
  
-To raise the soft limit up to the hard limit for your Synchronet user, it is recommended to add this line: +<file sbbs.service> 
- +LimitNOFILE=10000
-<file limits.conf> +
-yourBBSuser     soft     nofile     unlimited+
 </file> </file>
  
-If you are still receiving ERROR 24, try raising both limits for all users by adding these lines instead:+After adding the line, reload the service file from the command line using ''systemctl daemon-reload''. Finally, restart Synchronet. 
 + 
 +**If you start Synchronet manually or with a shell script**\\ 
 +If you start sbbs with a shell script, manually from the command line, or some other similar method, edit ''/etc/security/limits.conf'' to add the lines below. 
 + 
 +To raise the soft limit for your Synchronet user, add this line:
  
 <file limits.conf> <file limits.conf>
-*               hard     nofile     unlimited +yourBBSuser     soft     nofile     10000
-*               soft     nofile     unlimited+
 </file> </file>
- + 
 + 
 +      
 ===== See Also ===== ===== See Also =====
   * [[:faq:|Frequently Asked Questions]]   * [[:faq:|Frequently Asked Questions]]

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