https://bz.apache.org/bugzilla/show_bug.cgi?id=65641

            Bug ID: 65641
           Summary: (22)Invalid argument: AH02454: HTTPS: attempt to
                    connect to Unix domain socket
           Product: Apache httpd-2
           Version: 2.4.41
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy
          Assignee: bugs@httpd.apache.org
          Reporter: 2005w...@gmail.com
  Target Milestone: ---

Hello, I recently found that when httpd works as a reverse proxy, a 503 error
occurs occasionally. The log is printed as follows:

[Sun Oct 17 02:55:01.091087 2021] [proxy:error] [pid 1212:tid 139759928190720]
(22)Invalid argument: AH02454: HTTPS: attempt to connect to Unix domain socket
/usr/local/apache/logs/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbaaaadddddddddddddaaaaa
(web-vip) failed
[Sun Oct 17 02:55:01.091119 2021] [proxy_http:error] [pid 1212:tid
139759928190720] [client 10.232.234.195:53582] AH01114: HTTP: failed to make
connection to backend: httpd-UDS, referer: https://www.sitemask.com/
[Sun Oct 17 02:55:01.901670 2021] [proxy:error] [pid 1212:tid 139759844271872]
(22)Invalid argument: AH02454: HTTPS: attempt to connect to Unix domain socket
/usr/local/apache/logs/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbaaaadddddddddddddaaaaa
(web-vip) failed
[Sun Oct 17 02:55:01.901713 2021] [proxy_http:error] [pid 1212:tid
139759844271872] [client 10.232.134.78:39138] AH01114: HTTP: failed to make
connection to backend: httpd-UDS, referer: https://www.sitemask.com/

Other information is as follows:
/usr/local/apache/bin/httpd -V
Server version: Apache/2.4.41 (Unix)
Server built:   Sep  6 2019 02:56:34
Server's Module Magic Number: 20120211:88
Server loaded:  APR 1.6.3, APR-UTIL 1.6.1
Compiled using: APR 1.6.3, APR-UTIL 1.6.1
Architecture:   64-bit
Server MPM:     worker
  threaded:     yes (fixed thread count)
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/usr/local/apache"
 -D SUEXEC_BIN="/usr/local/apache/bin/suexec"
 -D DEFAULT_PIDLOG="logs/httpd.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="conf/mime.types"
 -D SERVER_CONFIG_FILE="conf/httpd.conf

ulimit -a
core file size          (blocks, -c) unlimited
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 30446
max locked memory       (kbytes, -l) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1048576
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) unlimited
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

uname -a
Linux web-prod-rs-v030-n4gl9 5.4.110-54.182.amzn2.x86_64 #1 SMP Fri Apr 9
17:56:33 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

The uds file name completely exceeds the file name size limit of the Linux
system.

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