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Lots (over 16k) of "Open slot with no current process" in Apache...

Discussion in 'General Discussion' started by RobinF28, Aug 10, 2015.

  1. RobinF28

    RobinF28 Member

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    Hi everyone,

    I noticed my server was serving much more slowly recently, with webpages taking a much longer time to load - so I took a loot at the Apache Status in my WHM control panel.

    There are over 16K (thousand!) <"." open slot with no current process> showing, whereas normally there would only be a few lines of these ". dots"

    Could this be a symptom or a clue to a cause, do you think?

    There are exactly 125 lines of:-
    Code:
    Srv PID Acc M CPU SS Req Conn Child Slot Client VHost Request
    0-10 13626 0/3/78 _ 5.09 86 4 0.0 0.02 1.15 127.0.0.1 abc.xxxxxxx.ie GET /whm-server-status?auto HTTP/1.1
    
    .. following after the "...................." listing which seems normal, just soooo many "." dots!!

    Details:

    Code:
    Apache server status for abc.xxxxxx.ie
    
    Server Version: Apache/2.2.29 (Unix) mod_ssl/2.2.29 OpenSSL/1.0.1e-fips DAV/2 mod_bwlimited/1.4
    Server Built: Jun 28 2015 18:54:58
    
    Current Time: Sunday, 09-Aug-2015 21:04:27 IST
    Restart Time: Sunday, 09-Aug-2015 20:32:29 IST
    Parent Server Generation: 0
    Server uptime: 31 minutes 58 seconds
    Total accesses: 287 - Total Traffic: 4.8 MB
    CPU Usage: u1.74 s.43 cu34.28 cs0 - 1.9% CPU load
    .15 requests/sec - 2604 B/second - 17.0 kB/request
    1 requests currently being processed, 124 idle workers
    
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    <etc.........> ....lots (thousands!!) more....!!!
    
    There are a few WordPress websites on the VPS server but they do not attract much traffic and all the MUNIN statistics are looking the same as normal, for the past 10 months - no obvious change is the readings etc.

    Nothing seems broken, all sites are functioning normally, just taking a much longer time to load.

    Any help would be really appreciated.

    Let me know if you would like other information, thanks.

    - Robin.
     
    #1 RobinF28, Aug 10, 2015
    Last edited by a moderator: Aug 11, 2015
  2. RobinF28

    RobinF28 Member

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    Hi,

    I was wondering if anyone can help me understand where I can set (or control) the number of "Open slot with no current process" in the Apache Status information?

    These "open slots" are displayed as a dot <.> in the output, as you know.

    I have 256 lines of these dots (open slots) - whicu equates to over 16 thousand open slots - and it may be connected to a remarkanble slowing down of my server/websites??

    My server info is:-

    Apache server status for abc.xxxxxx.xx
    Server Version: Apache/2.2.29 (Unix) mod_ssl/2.2.29 OpenSSL/1.0.1e-fips DAV/2 mod_bwlimited/1.4
    Server Built: Jun 28 2015 18:54:58
    I would really appreciate any help or information anybody might give, thanks.

    - Robin.
     
  3. RobinF28

    RobinF28 Member

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    Hi Michael,

    Many thanks for your reply.

    Yes, I have checked out these links, very interesting, but not helping with my particular query.

    I installed CSF a week or so ago, and all went well. It's configured to the default settings and runs well, catching repeated multiple login attempts etc. No increase in server/CPU load noted in the MUNIN stats. All seems fine with the firewall.

    My issue is with the many "open slots" that jumped from a nominal amount (as I had been experiencing over the months since using the VPS) to a very large amount in the past few days.

    Here is my Apache status....

    Code:
    Apache server status for xxx.xxxxxxx.ie
    
    Server Version: Apache/2.2.29 (Unix) mod_ssl/2.2.29 OpenSSL/1.0.1e-fips DAV/2 mod_bwlimited/1.4
    Server Built: Jun 28 2015 18:54:58
    
    Current Time: Tuesday, 11-Aug-2015 23:50:08 IST
    Restart Time: Monday, 10-Aug-2015 20:09:37 IST
    Parent Server Generation: 15
    Server uptime: 1 day 3 hours 40 minutes 31 seconds
    Total accesses: 20244 - Total Traffic: 428.4 MB
    CPU Usage: u6.71 s2.06 cu181.86 cs0 - .191% CPU load
    .203 requests/sec - 4508 B/second - 21.7 kB/request
    1 requests currently being processed, 124 idle workers
    
    _________________________.......................................
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    Scoreboard Key:
    "_" Waiting for Connection, "S" Starting up, "R" Reading Request,
    "W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
    "C" Closing connection, "L" Logging, "G" Gracefully finishing,
    "I" Idle cleanup of worker, "." Open slot with no current process
    
    As you can see - a LOT of open slots!

    This is huge compared to the three or four lines of <.> dots - open slots - which I used to see every time I checked the Apache status.

    Do you suggest any method of investigating how there can suddenly be so many open slots?

    BTW:
    > I have restated the Apache server a many times, but no change in # of open slots.
    > Server load is very low.
    > Memory usage is still normal, no increase or decrease in past moths.
    > CSF installed a week ago.
    > No unusual DOS like activity in process or error logs.
    > Traffic in/out still low
    > mySql loads remain normal & low

    Is there a way to control or reduce/limit the number of open slots?
    Or, could this be nothing to do with the slow down of the server?

    You support in appreciated, thanks.

    - Robin.
     
  4. RobinF28

    RobinF28 Member

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    Hi again,

    Is there a way to control these "open slots"?
    The problem remains, unfortunately.

    CSF make no difference, although I like it and I'll keep it installed/enabled.

    Regards, Robin.
     
  5. RobinF28

    RobinF28 Member

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    Hi again,

    UPDATE:

    I did some digging into my yum.log and noticed that the "slowing down" of my server and the numerous ". Open slot with no current process" in my Apache status log COINCIDED with many (automatic) updates to my server, as follows...

    Code:
    Aug 05 03:23:58 Updated: ESO-utils-1.0-5.el6.noarch
    Aug 06 03:23:57 Updated: ESO-utils-1.0-7.el6.noarch
    Aug 07 03:24:45 Updated: libgcc-4.4.7-16.el6.x86_64
    Aug 07 03:24:48 Updated: ncurses-base-5.7-4.20090207.el6.x86_64
    Aug 07 03:25:04 Updated: glibc-common-2.12-1.166.el6_7.1.x86_64
    Aug 07 03:25:11 Updated: glibc-2.12-1.166.el6_7.1.x86_64
    Aug 07 03:25:11 Updated: ncurses-libs-5.7-4.20090207.el6.x86_64
    Aug 07 03:25:12 Updated: bash-4.1.2-33.el6.x86_64
    Aug 07 03:25:12 Updated: libcom_err-1.41.12-22.el6.x86_64
    Aug 07 03:25:14 Updated: chkconfig-1.3.49.3-5.el6.x86_64
    Aug 07 03:25:15 Updated: krb5-libs-1.10.3-42.el6.x86_64
    Aug 07 03:25:17 Updated: openssl-1.0.1e-42.el6.x86_64
    Aug 07 03:25:17 Updated: libstdc++-4.4.7-16.el6.x86_64
    Aug 07 03:25:18 Updated: elfutils-libelf-0.161-3.el6.x86_64
    Aug 07 03:25:19 Updated: libcurl-7.19.7-46.el6.x86_64
    Aug 07 03:25:19 Updated: rpm-libs-4.8.0-47.el6.x86_64
    Aug 07 03:25:20 Updated: curl-7.19.7-46.el6.x86_64
    Aug 07 03:25:22 Updated: rpm-4.8.0-47.el6.x86_64
    Aug 07 03:25:23 Updated: openldap-2.4.40-5.el6.x86_64
    Aug 07 03:25:24 Updated: libxml2-2.7.6-20.el6.x86_64
    Aug 07 03:25:25 Updated: 32:bind-libs-9.8.2-0.37.rc1.el6_7.2.x86_64
    Aug 07 03:25:25 Updated: e2fsprogs-libs-1.41.12-22.el6.x86_64
    Aug 07 03:25:26 Updated: gdbm-1.8.0-38.el6.x86_64
    Aug 07 03:25:26 Updated: 1:perl-Pod-Escapes-1.04-141.el6.x86_64
    Aug 07 03:25:26 Updated: 1:perl-Module-Pluggable-3.90-141.el6.x86_64
    Aug 07 03:25:28 Updated: 1:perl-Pod-Simple-3.13-141.el6.x86_64
    Aug 07 03:25:28 Updated: 3:perl-version-0.77-141.el6.x86_64
    Aug 07 03:25:29 Updated: 4:perl-libs-5.10.1-141.el6.x86_64
    Aug 07 03:25:43 Updated: 4:perl-5.10.1-141.el6.x86_64
    Aug 07 03:25:43 Updated: 1:perl-Locale-Maketext-Simple-0.18-141.el6.x86_64
    Aug 07 03:25:43 Updated: 1:perl-Params-Check-0.26-141.el6.x86_64
    Aug 07 03:25:44 Updated: perl-IO-Compress-Base-2.021-141.el6.x86_64
    Aug 07 03:25:44 Updated: 1:perl-Module-Load-0.16-141.el6.x86_64
    Aug 07 03:25:45 Updated: perl-Module-Load-Conditional-0.30-141.el6.x86_64
    Aug 07 03:25:45 Updated: 1:perl-Log-Message-0.02-141.el6.x86_64
    Aug 07 03:25:46 Updated: 1:perl-Compress-Raw-Zlib-2.021-141.el6.x86_64
    Aug 07 03:25:46 Updated: 1:perl-Package-Constants-0.02-141.el6.x86_64
    Aug 07 03:25:47 Updated: python-2.6.6-64.el6.x86_64
    Aug 07 03:26:07 Updated: python-libs-2.6.6-64.el6.x86_64
    Aug 07 03:26:08 Updated: perl-IO-Compress-Zlib-2.021-141.el6.x86_64
    Aug 07 03:26:09 Updated: perl-Compress-Zlib-2.021-141.el6.x86_64
    Aug 07 03:26:09 Updated: 1:perl-IO-Zlib-1.09-141.el6.x86_64
    Aug 07 03:26:10 Updated: perl-Archive-Tar-1.58-141.el6.x86_64
    Aug 07 03:26:10 Updated: perl-Log-Message-Simple-0.04-141.el6.x86_64
    Aug 07 03:26:11 Updated: perl-Term-UI-0.20-141.el6.x86_64
    Aug 07 03:26:11 Updated: 1:perl-Object-Accessor-0.34-141.el6.x86_64
    Aug 07 03:26:12 Updated: 1:perl-Module-Loaded-0.02-141.el6.x86_64
    Aug 07 03:26:12 Updated: perl-Compress-Raw-Bzip2-2.021-141.el6.x86_64
    Aug 07 03:26:14 Updated: 1:net-snmp-libs-5.5-54.el6.x86_64
    Aug 07 03:26:14 Updated: perl-Module-CoreList-2.18-141.el6.x86_64
    Aug 07 03:26:15 Updated: 1:perl-Digest-SHA-5.47-141.el6.x86_64
    Aug 07 03:26:16 Updated: gnutls-2.8.5-18.el6.x86_64
    Aug 07 03:26:16 Updated: 1:cups-libs-1.4.2-72.el6.x86_64
    Aug 07 03:26:17 Updated: pcre-7.8-7.el6.x86_64
    Aug 07 03:26:19 Updated: grep-2.20-3.el6.x86_64
    Aug 07 03:26:20 Updated: libicu-4.2.1-12.el6.x86_64
    Aug 07 03:26:20 Updated: libcom_err-devel-1.41.12-22.el6.x86_64
    Aug 07 03:26:21 Updated: libgomp-4.4.7-16.el6.x86_64
    Aug 07 03:26:23 Updated: binutils-2.20.51.0.2-5.43.el6.x86_64
    Aug 07 03:26:24 Updated: module-init-tools-3.9-25.el6.x86_64
    Aug 07 03:26:25 Updated: libxcb-1.9.1-3.el6.x86_64
    Aug 07 03:26:26 Updated: sysvinit-tools-2.87-6.dsf.el6.x86_64
    Aug 07 03:26:37 Updated: libxcb-devel-1.9.1-3.el6.x86_64
    Aug 07 03:26:38 Updated: hwdata-0.233-14.1.el6.noarch
    Aug 07 03:26:41 Updated: krb5-devel-1.10.3-42.el6.x86_64
    Aug 07 03:26:41 Updated: perl-IO-Compress-Bzip2-2.021-141.el6.x86_64
    Aug 07 03:26:42 Updated: rpm-python-4.8.0-47.el6.x86_64
    Aug 07 03:26:44 Installed: yum-3.2.29-69.el6.centos.noarch
    Aug 07 03:26:45 Updated: 4:perl-Time-HiRes-1.9721-141.el6.x86_64
    Aug 07 03:26:45 Updated: perl-Time-Piece-1.15-141.el6.x86_64
    Aug 07 03:26:46 Updated: 1:perl-Parse-CPAN-Meta-1.40-141.el6.x86_64
    Aug 07 03:26:47 Updated: perl-CGI-3.51-141.el6.x86_64
    Aug 07 03:26:47 Updated: 1:perl-parent-0.221-141.el6.x86_64
    Aug 07 03:26:48 Updated: gdbm-devel-1.8.0-38.el6.x86_64
    Aug 07 03:26:49 Updated: elfutils-libs-0.161-3.el6.x86_64
    Aug 07 03:26:56 Updated: libstdc++-devel-4.4.7-16.el6.x86_64
    Aug 07 03:26:56 Updated: libss-1.41.12-22.el6.x86_64
    Aug 07 03:26:57 Updated: e2fsprogs-1.41.12-22.el6.x86_64
    Aug 07 03:26:58 Updated: cpp-4.4.7-16.el6.x86_64
    Aug 07 03:26:59 Updated: logrotate-3.7.8-23.el6.x86_64
    Aug 07 03:26:59 Updated: 2:vim-minimal-7.4.629-5.el6.x86_64
    Aug 07 03:27:01 Updated: procps-3.2.8-33.el6.x86_64
    Aug 07 03:27:01 Updated: 14:libpcap-1.4.0-4.20130826git2dbcaa1.el6.x86_64
    Aug 07 03:27:02 Updated: libsemanage-2.0.43-5.1.el6.x86_64
    Aug 07 03:27:03 Updated: 2:ethtool-3.5-6.el6.x86_64
    Aug 07 03:27:04 Installed: 2:vim-filesystem-7.4.629-5.el6.x86_64
    Aug 07 03:27:07 Updated: 2:vim-common-7.4.629-5.el6.x86_64
    Aug 07 03:27:07 Updated: centos-release-6-7.el6.centos.12.3.x86_64
    Aug 07 03:27:08 Updated: iputils-20071127-20.el6.x86_64
    Aug 07 03:27:12 Updated: initscripts-9.03.49-1.el6.centos.x86_64
    Aug 07 03:27:14 Updated: udev-147-2.63.el6.x86_64
    Aug 07 03:27:15 Updated: cronie-noanacron-1.4.4-15.el6.x86_64
    Aug 07 03:27:16 Updated: cronie-1.4.4-15.el6.x86_64
    Aug 07 03:27:16 Updated: openssh-5.3p1-111.el6.x86_64
    Aug 07 03:27:19 Updated: policycoreutils-2.0.83-24.el6.x86_64
    Aug 07 03:27:22 Updated: 1:quota-3.17-23.el6.x86_64
    Aug 07 03:27:23 Updated: samba-winbind-clients-3.6.23-20.el6.x86_64
    Aug 07 03:27:26 Updated: samba-common-3.6.23-20.el6.x86_64
    Aug 07 03:27:27 Updated: samba-winbind-3.6.23-20.el6.x86_64
    Aug 07 03:27:29 Updated: libX11-common-1.6.0-6.el6.noarch
    Aug 07 03:27:30 Updated: libX11-1.6.0-6.el6.x86_64
    Aug 07 03:27:36 Updated: ghostscript-8.70-21.el6.x86_64
    Aug 07 03:27:37 Updated: ghostscript-devel-8.70-21.el6.x86_64
    Aug 07 03:27:40 Updated: ImageMagick-6.7.2.7-2.el6.x86_64
    Aug 07 03:27:46 Updated: libX11-devel-1.6.0-6.el6.x86_64
    Aug 07 03:27:48 Updated: tkinter-2.6.6-64.el6.x86_64
    Aug 07 03:27:48 Updated: 12:dhcp-common-4.1.1-49.P1.el6.centos.x86_64
    Aug 07 03:27:54 Updated: kernel-headers-2.6.32-573.1.1.el6.x86_64
    Aug 07 03:27:59 Updated: glibc-2.12-1.166.el6_7.1.i686
    Aug 07 03:28:04 Updated: glibc-headers-2.12-1.166.el6_7.1.x86_64
    Aug 07 03:28:05 Updated: glibc-devel-2.12-1.166.el6_7.1.x86_64
    Aug 07 03:28:07 Updated: perl-Test-Harness-3.17-141.el6.x86_64
    Aug 07 03:28:10 Updated: perl-ExtUtils-MakeMaker-6.55-141.el6.x86_64
    Aug 07 03:28:11 Updated: 4:perl-devel-5.10.1-141.el6.x86_64
    Aug 07 03:28:11 Updated: 1:perl-ExtUtils-ParseXS-2.2003.0-141.el6.x86_64
    Aug 07 03:28:12 Updated: 1:perl-IPC-Cmd-0.56-141.el6.x86_64
    Aug 07 03:28:12 Updated: perl-File-Fetch-0.26-141.el6.x86_64
    Aug 07 03:28:12 Updated: 1:perl-Archive-Extract-0.38-141.el6.x86_64
    Aug 07 03:28:13 Updated: 1:perl-ExtUtils-CBuilder-0.27-141.el6.x86_64
    Aug 07 03:28:15 Updated: 1:perl-Module-Build-0.3500-141.el6.x86_64
    Aug 07 03:28:17 Updated: perl-CPANPLUS-0.88-141.el6.x86_64
    Aug 07 03:28:18 Updated: perl-Test-Simple-0.92-141.el6.x86_64
    Aug 07 03:28:18 Updated: perl-ExtUtils-Embed-1.28-141.el6.x86_64
    Aug 07 03:28:20 Updated: perl-CPAN-1.9402-141.el6.x86_64
    Aug 07 03:28:23 Updated: gcc-4.4.7-16.el6.x86_64
    Aug 07 03:28:23 Updated: libcom_err-1.41.12-22.el6.i686
    Aug 07 03:28:23 Updated: libgcc-4.4.7-16.el6.i686
    Aug 07 03:28:24 Updated: gcc-c++-4.4.7-16.el6.x86_64
    Aug 07 03:28:25 Updated: perl-core-5.10.1-141.el6.x86_64
    Aug 07 03:28:25 Updated: glibc-static-2.12-1.166.el6_7.1.x86_64
    Aug 07 03:28:26 Updated: 12:dhclient-4.1.1-49.P1.el6.centos.x86_64
    Aug 07 03:28:33 Updated: python-tools-2.6.6-64.el6.x86_64
    Aug 07 03:28:35 Updated: ImageMagick-devel-6.7.2.7-2.el6.x86_64
    Aug 07 03:28:37 Updated: samba-client-3.6.23-20.el6.x86_64
    Aug 07 03:28:40 Updated: samba-3.6.23-20.el6.x86_64
    Aug 07 03:28:40 Updated: 1:quota-devel-3.17-23.el6.x86_64
    Aug 07 03:28:42 Updated: iptables-1.4.7-16.el6.x86_64
    Aug 07 03:28:43 Updated: openssh-clients-5.3p1-111.el6.x86_64
    Aug 07 03:28:44 Updated: openssh-server-5.3p1-111.el6.x86_64
    Aug 07 03:28:44 Updated: yum-cron-3.2.29-69.el6.centos.noarch
    Aug 07 03:28:46 Updated: 1:net-snmp-5.5-54.el6.x86_64
    Aug 07 03:28:46 Updated: at-3.1.10-48.el6.x86_64
    Aug 07 03:28:47 Updated: 2:vim-enhanced-7.4.629-5.el6.x86_64
    Aug 07 03:28:48 Updated: 14:tcpdump-4.0.0-5.20090921gitdf3cb4.2.el6.x86_64
    Aug 07 03:28:49 Updated: sudo-1.8.6p3-19.el6.x86_64
    Aug 07 03:28:50 Updated: elfutils-0.161-3.el6.x86_64
    Aug 07 03:28:54 Updated: openssl-devel-1.0.1e-42.el6.x86_64
    Aug 07 03:28:55 Updated: e2fsprogs-devel-1.41.12-22.el6.x86_64
    Aug 07 03:28:58 Updated: libicu-devel-4.2.1-12.el6.x86_64
    Aug 07 03:28:59 Updated: icu-4.2.1-12.el6.x86_64
    Aug 07 03:29:04 Updated: 32:bind-9.8.2-0.37.rc1.el6_7.2.x86_64
    Aug 07 03:29:05 Updated: mlocate-0.22.2-6.el6.x86_64
    Aug 07 03:29:08 Updated: zsh-4.3.11-4.el6.centos.x86_64
    Aug 07 03:29:10 Updated: pcre-devel-7.8-7.el6.x86_64
    Aug 07 03:29:12 Updated: lftp-4.0.9-6.el6.x86_64
    Aug 07 03:29:13 Updated: 1:net-snmp-utils-5.5-54.el6.x86_64
    Aug 07 03:29:15 Updated: python-devel-2.6.6-64.el6.x86_64
    Aug 07 03:29:20 Updated: libxml2-devel-2.7.6-20.el6.x86_64
    Aug 07 03:29:21 Updated: authconfig-6.1.12-23.el6.x86_64
    Aug 07 03:29:22 Updated: 32:bind-utils-9.8.2-0.37.rc1.el6_7.2.x86_64
    Aug 07 03:29:26 Updated: 32:bind-devel-9.8.2-0.37.rc1.el6_7.2.x86_64
    Aug 07 03:29:29 Updated: libuser-0.56.13-8.el6_7.x86_64
    Aug 07 03:29:29 Updated: ntsysv-1.3.49.3-5.el6.x86_64
    Aug 07 03:29:29 Updated: pinentry-0.7.6-8.el6.x86_64
    Aug 07 03:29:30 Updated: nscd-2.12-1.166.el6_7.1.x86_64
    Aug 07 03:29:34 Updated: libgcj-4.4.7-16.el6.x86_64
    Aug 07 03:29:34 Updated: strace-4.8-10.el6.x86_64
    Aug 07 03:29:37 Updated: ncurses-devel-5.7-4.20090207.el6.x86_64
    Aug 07 03:29:38 Updated: screen-4.0.3-18.el6.x86_64
    Aug 07 03:29:39 Updated: polkit-0.96-11.el6.x86_64
    Aug 07 03:29:39 Updated: time-1.7-38.el6.x86_64
    Aug 07 03:29:41 Updated: 2:tar-1.23-13.el6.x86_64
    Aug 07 03:29:42 Updated: ncurses-5.7-4.20090207.el6.x86_64
    Aug 07 03:29:43 Updated: lsof-4.82-5.el6.x86_64
    Aug 07 03:29:43 Updated: libstdc++-4.4.7-16.el6.i686
    Aug 07 03:29:44 Updated: e2fsprogs-libs-1.41.12-22.el6.i686
    Aug 07 03:29:45 Updated: libxml2-2.7.6-20.el6.i686
    Aug 07 03:29:45 Updated: ncurses-libs-5.7-4.20090207.el6.i686
    Aug 07 03:31:33 Erased: yum-plugin-downloadonly
    
    I'm pretty sure these updates were cPanel driven - perhaps someone can confirm/deny - so could you please help me with investigating what has happened????

    What are open slots?
    How can I control them, or does this really matter?

    Thank you.

    Regards, Robin.
     
  6. cPanelMichael

    cPanelMichael Forums Analyst
    Staff Member

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    Hello :)

    The update output is from your system package manager (YUM). It's important to keep your system updated, but you can disable automatic updates via the "Operating System Package Updates" option in "WHM Home >> Server Configuration >> Update Preferences". Do you notice any error messages in /usr/local/apache/logs/error_log regarding the number of open slots, or does the issue persist when disabling the automatic updates?

    Thank you.
     
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