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Updated by Frank Schmid over 7 years ago
Currently, almost every morning, after inactivity overnight, a proxy error occurs when accessing the OpenProject Server. Only a server restart solves the issue.
**System info:**
* Ubuntu 18.04.1 LTS 64 bit
* Package installation
* Apache 2.4.29
* MySql 14.14
* A backup runs at night (cron)
**Error displayed in browser:**
```text
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET/.
Reason: Error reading from remote server
```
**/var/log/apache2/error.log:**
```text
[Mon Dec 03 06:25:09.294792 2018] [mpm_event:notice] [pid 6768:tid 140423162780608] AH00489: Apache/2.4.29 (Ubuntu) SVN/1.9.7 OpenSSL/1.1.0g mod_perl/2.0.10 Perl/v5.26.1 configured -- resuming normal operations
[Mon Dec 03 06:25:09.294869 2018] [core:notice] [pid 6768:tid 140423162780608] AH00094: Command line: '/usr/sbin/apache2'
[Mon Dec 03 08:27:51.942109 2018] [proxy_http:error] [pid 9543:tid 140422873605888] (20014)Internal error (specific information not available): [client 192.168.100.68:57408] AH01102: error reading status line from remote server 127.0.0.1:6000
[Mon Dec 03 08:27:51.942345 2018] [proxy:error] [pid 9543:tid 140422873605888] [client 192.168.100.68:57408] AH00898: Error reading from remote server returned by /
[Mon Dec 03 08:28:19.394169 2018] [proxy_http:error] [pid 9543:tid 140422680672000] (20014)Internal error (specific information not available): [client 192.168.100.68:57408] AH01102: error reading status line from remote server 127.0.0.1:6000
```
**/var/log/openproject/production.log:**
```text
W, [2018-12-03T06:55:07.124459 #9735] WARN -- : hook registered
W, [2018-12-03T06:55:07.138196 #9735] WARN -- : [auth_saml] Missing settings from '/opt/openproject/config/plugins/auth_saml/settings.yml', skipping omniauth registration.
W, [2018-12-03T07:55:08.004607 #9783] WARN -- : hook registered
W, [2018-12-03T07:55:08.021186 #9783] WARN -- : [auth_saml] Missing settings from '/opt/openproject/config/plugins/auth_saml/settings.yml', skipping omniauth registration.
I, [2018-12-03T08:27:41.640559 #1861] INFO -- : Started GET "/" for 127.0.0.1 at 2018-12-03 08:27:41 +0100
I, [2018-12-03T08:29:08.863499 #1237] INFO -- : 2018-12-03T08:29:08+0100: [Worker(host:openprojectserver pid:1237)] Exiting...
```
Same problem already described in this ticket: ##24615
**System info:**
* Ubuntu 18.04.1 LTS 64 bit
* Package installation
* Apache 2.4.29
* MySql 14.14
* A backup runs at night (cron)
**Error displayed in browser:**
```text
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET/.
Reason: Error reading from remote server
```
**/var/log/apache2/error.log:**
```text
[Mon Dec 03 06:25:09.294792 2018] [mpm_event:notice] [pid 6768:tid 140423162780608] AH00489: Apache/2.4.29 (Ubuntu) SVN/1.9.7 OpenSSL/1.1.0g mod_perl/2.0.10 Perl/v5.26.1 configured -- resuming normal operations
[Mon Dec 03 06:25:09.294869 2018] [core:notice] [pid 6768:tid 140423162780608] AH00094: Command line: '/usr/sbin/apache2'
[Mon Dec 03 08:27:51.942109 2018] [proxy_http:error] [pid 9543:tid 140422873605888] (20014)Internal error (specific information not available): [client 192.168.100.68:57408] AH01102: error reading status line from remote server 127.0.0.1:6000
[Mon Dec 03 08:27:51.942345 2018] [proxy:error] [pid 9543:tid 140422873605888] [client 192.168.100.68:57408] AH00898: Error reading from remote server returned by /
[Mon Dec 03 08:28:19.394169 2018] [proxy_http:error] [pid 9543:tid 140422680672000] (20014)Internal error (specific information not available): [client 192.168.100.68:57408] AH01102: error reading status line from remote server 127.0.0.1:6000
```
**/var/log/openproject/production.log:**
```text
W, [2018-12-03T06:55:07.124459 #9735] WARN -- : hook registered
W, [2018-12-03T06:55:07.138196 #9735] WARN -- : [auth_saml] Missing settings from '/opt/openproject/config/plugins/auth_saml/settings.yml', skipping omniauth registration.
W, [2018-12-03T07:55:08.004607 #9783] WARN -- : hook registered
W, [2018-12-03T07:55:08.021186 #9783] WARN -- : [auth_saml] Missing settings from '/opt/openproject/config/plugins/auth_saml/settings.yml', skipping omniauth registration.
I, [2018-12-03T08:27:41.640559 #1861] INFO -- : Started GET "/" for 127.0.0.1 at 2018-12-03 08:27:41 +0100
I, [2018-12-03T08:29:08.863499 #1237] INFO -- : 2018-12-03T08:29:08+0100: [Worker(host:openprojectserver pid:1237)] Exiting...
```
Same problem already described in this ticket: ##24615