[Thu Mar 31 23:16:34.633902 2016] [proxy:error] [pid 26661] (2)No such file or directory: AH02454: HTTP: attempt to connect to Unix domain socket /var/run/koha/domain/plack.sock (localhost) failed
[Thu Mar 31 23:16:34.634005 2016] [proxy:error] [pid 26661] AH00959: ap_proxy_connect_backend disabling worker for (localhost) for 60s
[Thu Mar 31 23:16:34.634014 2016] [proxy_http:error] [pid 26661] [client 192.168.197.2:40234] AH01114: HTTP: failed to make connection to backend: httpd-UDS, referer: http://172.21.0.170:8080/cgi-bin/koha/about.pl
[Thu Mar 31 23:16:35.902994 2016] [proxy:error] [pid 26663] (2)No such file or directory: AH02454: HTTP: attempt to connect to Unix domain socket /var/run/koha/domain/plack.sock (localhost) failed
[Thu Mar 31 23:16:35.903090 2016] [proxy:error] [pid 26663] AH00959: ap_proxy_connect_backend disabling worker for (localhost) for 60s
[Thu Mar 31 23:16:35.903100 2016] [proxy_http:error] [pid 26663] [client 192.168.197.2:40236] AH01114: HTTP: failed to make connection to backend: httpd-UDS, referer: http://172.21.0.170:8080/cgi-bin/koha/about.pl
[Fri Apr 01 01:05:21.530033 2016] [cgi:error] [pid 2122] [client 192.168.197.2:58904] AH01215: [Fri Apr  1 01:05:21 2016] Tags.pm: Use of uninitialized value in subroutine entry at /usr/share/koha/lib/Koha/Cache.pm line 287, <DATA> line 751.
[Fri Apr 01 01:05:21.530471 2016] [cgi:error] [pid 2122] [client 192.168.197.2:58904] AH01215: [Fri Apr  1 01:05:21 2016] Tags.pm: Use of uninitialized value in subroutine entry at /usr/share/koha/lib/Koha/Cache.pm line 287, <DATA> line 751.
[Fri Apr 01 01:34:49.094515 2016] [cgi:error] [pid 22666] [client 192.168.197.4:56326] AH01215: [Fri Apr  1 01:34:49 2016] Tags.pm: Use of uninitialized value in subroutine entry at /usr/share/koha/lib/Koha/Cache.pm line 287, <DATA> line 751.
[Fri Apr 01 01:34:49.094775 2016] [cgi:error] [pid 22666] [client 192.168.197.4:56326] AH01215: [Fri Apr  1 01:34:49 2016] Tags.pm: Use of uninitialized value in subroutine entry at /usr/share/koha/lib/Koha/Cache.pm line 287, <DATA> line 751.

==> /var/log/koha/domain/opac-error.log <==
[Fri Apr 01 01:46:12.163745 2016] [cgi:error] [pid 23394] [client 10.185.0.253:54970] AH01215: [Fri Apr  1 01:46:12 2016] opac-search.pl: CGI::param called in list context from package main line 395, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436.
[Fri Apr 01 01:46:12.164425 2016] [cgi:error] [pid 23394] [client 10.185.0.253:54970] AH01215: [Fri Apr  1 01:46:12 2016] opac-search.pl: CGI::param called in list context from package main line 416, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436.
[Fri Apr 01 01:46:12.164815 2016] [cgi:error] [pid 23394] [client 10.185.0.253:54970] AH01215: [Fri Apr  1 01:46:12 2016] opac-search.pl: CGI::param called in list context from package main line 426, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436.
[Fri Apr 01 01:46:12.165086 2016] [cgi:error] [pid 23394] [client 10.185.0.253:54970] AH01215: [Fri Apr  1 01:46:12 2016] opac-search.pl: CGI::param called in list context from package main line 435, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436.
[Fri Apr 01 01:46:12.165375 2016] [cgi:error] [pid 23394] [client 10.185.0.253:54970] AH01215: [Fri Apr  1 01:46:12 2016] opac-search.pl: CGI::param called in list context from package main line 440, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436.
[Fri Apr 01 01:46:12.165642 2016] [cgi:error] [pid 23394] [client 10.185.0.253:54970] AH01215: [Fri Apr  1 01:46:12 2016] opac-search.pl: CGI::param called in list context from package main line 448, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436.
[Fri Apr 01 01:46:12.165906 2016] [cgi:error] [pid 23394] [client 10.185.0.253:54970] AH01215: [Fri Apr  1 01:46:12 2016] opac-search.pl: CGI::param called in list context from package main line 461, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436.
[Fri Apr 01 01:46:12.166211 2016] [cgi:error] [pid 23394] [client 10.185.0.253:54970] AH01215: [Fri Apr  1 01:46:12 2016] opac-search.pl: CGI::param called in list context from package main line 463, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436.
[Fri Apr 01 01:46:26.596046 2016] [cgi:error] [pid 23384] [client 10.185.0.253:54754] AH01215: [Fri Apr  1 01:46:26 2016] opac-search.pl: CGI::param called in list context from package main line 86, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436, <DATA> line 751.
[Fri Apr 01 01:46:26.596488 2016] [cgi:error] [pid 23384] [client 10.185.0.253:54754] AH01215: [Fri Apr  1 01:46:26 2016] opac-search.pl: CGI::param called in list context from package main line 87, this can lead to vulnerabilities. See the warning in "Fetching the value or values of a single named parameter" at /usr/share/perl5/CGI.pm line 436, <DATA> line 751.