1.Apache、mysql、proftpd正常，但访问禅道登录页是空白页

查看/opt/lampp/logs/error_log:

[Tue May 17 13:58:05.001422 2016] [ssl:warn] [pid 17392] AH01906: www.example.com:443:0 server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Tue May 17 13:58:05.001572 2016] [ssl:warn] [pid 17392] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Tue May 17 13:58:05.001769 2016] [suexec:notice] [pid 17392] AH01232: suEXEC mechanism enabled (wrapper: /opt/lampp/bin/suexec)
[Tue May 17 13:58:05.077559 2016] [auth_digest:notice] [pid 17393] AH01757: generating secret for digest authentication ...
[Tue May 17 13:58:06.002075 2016] [ssl:warn] [pid 17393] AH01906: www.example.com:443:0 server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Tue May 17 13:58:06.002158 2016] [ssl:warn] [pid 17393] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Tue May 17 13:58:06.002357 2016] [lbmethod_heartbeat:notice] [pid 17393] AH02282: No slotmem from mod_heartmonitor
[Tue May 17 13:58:06.014995 2016] [mpm_prefork:notice] [pid 17393] AH00163: Apache/2.4.10 (Unix) OpenSSL/1.0.1i PHP/5.4.31 mod_perl/2.0.8-dev Perl/v5.16.3 configured -- resuming normal operations
[Tue May 17 13:58:06.015049 2016] [core:notice] [pid 17393] AH00094: Command line: '/opt/lampp/bin/httpd -E /opt/lampp/logs/error_log -D SSL -D PHP'
[Tue May 17 13:58:10.779099 2016] [access_compat:error] [pid 17814] [client 10.163.9.140:53069] AH01797: client denied by server configuration: /opt/lampp/htdocs/zentaopms/www/
[Tue May 17 13:58:37.180982 2016] [access_compat:error] [pid 17815] [client 10.163.9.140:53091] AH01797: client denied by server configuration: /opt/lampp/htdocs/zentaopms/www/
[Tue May 17 14:00:16.982044 2016] [mpm_prefork:notice] [pid 17393] AH00169: caught SIGTERM, shutting down
[Tue May 17 14:00:23.001345 2016] [ssl:warn] [pid 17939] AH01906: www.example.com:443:0 server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Tue May 17 14:00:23.001466 2016] [ssl:warn] [pid 17939] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Tue May 17 14:00:23.001652 2016] [suexec:notice] [pid 17939] AH01232: suEXEC mechanism enabled (wrapper: /opt/lampp/bin/suexec)
[Tue May 17 14:00:23.074584 2016] [auth_digest:notice] [pid 17940] AH01757: generating secret for digest authentication ...
[Tue May 17 14:00:24.001895 2016] [ssl:warn] [pid 17940] AH01906: www.example.com:443:0 server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Tue May 17 14:00:24.001971 2016] [ssl:warn] [pid 17940] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Tue May 17 14:00:24.002189 2016] [lbmethod_heartbeat:notice] [pid 17940] AH02282: No slotmem from mod_heartmonitor
[Tue May 17 14:00:24.015261 2016] [mpm_prefork:notice] [pid 17940] AH00163: Apache/2.4.10 (Unix) OpenSSL/1.0.1i PHP/5.4.31 mod_perl/2.0.8-dev Perl/v5.16.3 configured -- resuming normal operations
[Tue May 17 14:00:24.015314 2016] [core:notice] [pid 17940] AH00094: Command line: '/opt/lampp/bin/httpd -E /opt/lampp/logs/error_log -D SSL -D PHP'
[Tue May 17 14:20:19.092576 2016] [auth_basic:error] [pid 18363] [client 10.163.9.140:54294] AH01617: user xampp: authentication failure for "/phpmyadmin": Password Mismatch
[Tue May 17 14:20:46.596117 2016] [auth_basic:error] [pid 18364] [client 10.163.9.140:54320] AH01618: user lampp not found: /phpmyadmin
[Tue May 17 15:33:31.042139 2016] [mpm_prefork:notice] [pid 17940] AH00169: caught SIGTERM, shutting down
[Tue May 17 15:33:54.001287 2016] [ssl:warn] [pid 21874] AH01906: www.example.com:443:0 server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Tue May 17 15:33:54.001441 2016] [ssl:warn] [pid 21874] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Tue May 17 15:33:54.001632 2016] [suexec:notice] [pid 21874] AH01232: suEXEC mechanism enabled (wrapper: /opt/lampp/bin/suexec)
[Tue May 17 15:33:54.072504 2016] [auth_digest:notice] [pid 21875] AH01757: generating secret for digest authentication ...
[Tue May 17 15:33:55.001972 2016] [ssl:warn] [pid 21875] AH01906: www.example.com:443:0 server certificate is a CA certificate (BasicConstraints: CA == TRUE !?)
[Tue May 17 15:33:55.002075 2016] [ssl:warn] [pid 21875] AH01909: www.example.com:443:0 server certificate does NOT include an ID which matches the server name
[Tue May 17 15:33:55.002270 2016] [lbmethod_heartbeat:notice] [pid 21875] AH02282: No slotmem from mod_heartmonitor
[Tue May 17 15:33:55.016440 2016] [mpm_prefork:notice] [pid 21875] AH00163: Apache/2.4.10 (Unix) OpenSSL/1.0.1i PHP/5.4.31 mod_perl/2.0.8-dev Perl/v5.16.3 configured -- resuming normal operations
[Tue May 17 15:33:55.016518 2016] [core:notice] [pid 21875] AH00094: Command line: '/opt/lampp/bin/httpd -E /opt/lampp/logs/error_log -D SSL -D PHP'

在打开debug之后，访问禅道登录页报错如下：

09:41:06 ERROR: SQLSTATE[HY000] [2002] Connection refused in /opt/lampp/htdocs/zentaopms/framework/router.class.php on line 1524, last called by /opt/lampp/htdocs/zentaopms/framework/router.class.php on line 1486 through function connectByPDO.
in /opt/lampp/htdocs/zentaopms/framework/router.class.php on line 1568 when visiting