Recently we have been getting an Proxy Error each time we try to change
some configuration in Jenkins.
On Save and Apply, Jenkins gives us the following error:
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request
Reason: Error reading from remote server
It happens only on Save/Apply. All other access to Jenkins works fine.
Happens with:
Jenkins LTS 2.277.4 (several plugins not updated)
Jenkins LTS 2.289.1 (all plugins updataed)
The Reverse Proxy configuration:
root@int-rproxy:/etc/apache2/sites-available# cat build-ci.conf
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
ServerAdmin [email protected]
Servername build-ci.company.com
ServerAlias build-ci-adm.company.com
AllowEncodedSlashes NoDecode
ErrorLog ${APACHE_LOG_DIR}/build-ci-error.log
CustomLog ${APACHE_LOG_DIR}/build-ci-access.log combined
SSLEngine on
SSLProxyEngine on
ProxyRequests Off
ProxyPreserveHost On
SSLCertificateFile /etc/ssl/entrust/ServerCertificate.crt
SSLCertificateKeyFile /etc/ssl/private/comp-rproxy.key
SSLCertificateChainFile /etc/ssl/entrust/Intermediate.crt
# Using self-signed certificate on build-ci-app
SSLProxyCheckPeerName off
SSLProxyCheckPeerCN off
SSLProxyVerify none
BrowserMatch "MSIE [2-6]" \
nokeepalive ssl-unclean-shutdown \
downgrade-1.0 force-response-1.0
ProxyPass / https://build-ci-app.company.com:8443/
ProxyPassReverse / https://build-ci-app.company.com:8443/
</VirtualHost>
<VirtualHost *:80>
RewriteEngine On
ServerName build-ci-adm.company.com
RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}
</VirtualHost>
</IfModule>
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