Site getting 500 error

I’ve got a number of accounts set up in Cyber Panel. Occasionally some will stop loading - producing a 500 error. Usually I can fix this issue by resetting the PHP on the account by either modifying the account or using the CLI cyberpanel changePHP command in terminal for the account. I haven’t been able to figure out why this is happening, but today I have a site that is having this issue, but the PHP reset isn’t fixing the problem.

Problem Domain:

I’ve done the following:

  • Set PHP to 7.4 via CLI cyberpanel changePHP --domainName --php 7.4
  • Modified the Website account via CyberPanel and setting the package and php and saving.
  • restarted Litespeed via command line: /usr/local/lsws/bin/lswsctrl restart
  • restarted nghttpx via command line: /etc/init.d/nghttpx restart
  • restarted PHP via command: killall -9 lsphp
  • Ran Fix Permissions on public_html folder in account’s File Manager within Cyber Panel
  • PHP error log is showing PHP Notice for undefined offsets and indexes but no Fatal Errors.

Any ideas on what’s causing the 500 error, or what else I can do to troubleshoot this? Also be nice to know why it keeps happening to random sites.


any system error? The website loads fine and in seconds, you know, when it actually loads… df -ih? centos or ubuntu?

Thanks for checking - sounds like it loaded for you? I can’t seem to get it to load at all. I’m now getting ERR_HTTP2_PROTOCOL_ERROR when I try to load it.

Getting this error in the litespeed error log now:

2022-08-02 02:52:40.061828 [NOTICE] [154169] [] No request delivery notification has been received from LSAPI application, possible dead lock.

Running Ubuntu 20.04

Nothing odd I can see in df -ih:

# df -ih
Filesystem     Inodes IUsed IFree IUse% Mounted on
udev             4.0M   466  4.0M    1% /dev
tmpfs            4.0M   798  4.0M    1% /run
/dev/vda1        157M  6.7M  150M    5% /
tmpfs            4.0M    10  4.0M    1% /dev/shm
tmpfs            4.0M     3  4.0M    1% /run/lock
tmpfs            4.0M    18  4.0M    1% /sys/fs/cgroup
/dev/loop0        11K   11K     0  100% /snap/core18/2409
/dev/loop2        11K   11K     0  100% /snap/core18/2538
/dev/loop3       1.6K  1.6K     0  100% /snap/lxd/21029
/dev/loop5        486   486     0  100% /snap/snapd/16292
/dev/vdb1         63M   621   63M    1% /mnt/blockstorage
/dev/loop7        486   486     0  100% /snap/snapd/16010
/dev/loop6        802   802     0  100% /snap/lxd/22753
/dev/loop8        12K   12K     0  100% /snap/core20/1581
tmpfs            4.0M    23  4.0M    1% /run/user/0
/dev/loop1        12K   12K     0  100% /snap/core20/1587

I believe I’ve found the issue with a slow php/mysql script causing the loading issue. I disabled it and restarted php and the site is loading again. Thanks for the help!

yeah look like a deadlocking script, and with high timeouts, it cause this. Good luck

i have same issue , how you fixed? thanks you

Explain a bit more about your issue?

hello shoaibkk can you check this please

there i posted more info with logs @shoaibkk