LiteSpeed Web Server Enterprise - Memory and 503 issue

[tsupport]

Hello,

I’m running the trial edition of LiteSpeed Web Server Enterprise on a DirectAdmin / AlmaLinux 8 server and have run into a repeatable memory issue that takes every virtual host offline.

Environment

• OS       : AlmaLinux 8.8
• Control panel : DirectAdmin 1.66.4, CustomBuild 2.0
• LSWS version : LiteSpeed Web Server Enterprise (trial)
• PHP handlers : Multi php 7.4, 8.2, 5.6 built via CustomBuild
• Server RAM  : 64 GB

What happens

1. After several hours of normal operation, memory_limit inside lsphp suddenly drops from the configured 8096M to 512M.
2. PHP quickly exhausts that limit and throws
   PHP Fatal error: Out of memory (allocated 627539968) (tried to allocate 8192 bytes)
3. After some time who i tried to solve the memory issue (many website refresh), all sites then return 503 Service Unavailable.
   2025-06-24 09:28:29.479577 [INFO] [526562] [T0] [...#APVH_www.tts.gr:443]
   connection to [uds://usr/local/lsws/extapp-sock/APVH_tts_Suphp74.sock] …
   error: No such file or directory!
   2025-06-24 09:28:29.479624 [NOTICE] … Max retries has been reached, 503!
   2025-06-24 09:28:29.479639 [NOTICE] … 503 Service Unavailable
   2025-06-24 09:28:30.954623 [INFO] … error: Connection refused!
   
   
   What I have verified/tried
   
   • memory_limit = 8096M in /usr/local/php74/lib/php.ini and confirmed via phpinfo() before the issue appears.
   • No .htaccess, pool, or per-virtual-host overrides exist.
   • Plenty of free RAM; no OOM-killer activity in dmesg or journal.
   • Cleared LSWS opcode & public caches, restarted the LiteSpeed service, and performed a full server reboot — the 503 error persisted every time.
     Questions
     1. Are you aware of any bug or trial-edition limitation that could force a 512 MB memory_limit?
     2. Does LSWS or the DirectAdmin integration have any hidden per-user or server-wide cap that could explain this?
     3. Which additional logs or debug flags would you like me to enable to help pinpoint the source of the override?
        Any guidance or a workaround would be greatly appreciated, as this is a production-bound migration test.
        
        
        Thank you in advance for your help.
        
        
        
        
        
        
        
        

 

[abk]

The trial is a Web Host Professional tier license so it doesn't have any limits outside of that specific license tier limits.
Since it appears you can reliably reproduce this issue, please submit a support ticket and server access and we can give this a more detailed check: https://store.litespeedtech.com/store/submitticket.php?step=2&deptid=2