i'm have this problem
i'm upgrade 9.3 to 10.3 and httpdmng not work
then upgrade to 10.4.4
moment
file: /usr/local/psa/admin/plib/common_func.php3
line: 1047
code: 0
trace: #0 /usr/local/psa/admin/plib/common_func.php3(965): util_exec('httpdmng', Array, Array, 'msg', NULL)
#1...