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SUSE Manager API stops executing and exits with error 500

This document (000019835) is provided subject to the disclaimer at the end of this document.


SUSE Manager Server 4.1
SUSE Manager Server 4.0


Events scheduled via the API are not being executed and the api reports an error 500:
<ProtocolError for 500 Internal Server Error>

When checking the Apache error_log the following errors can be found:

[Sat Dec 26 14:10:34.420458 2020] [proxy_ajp:error] [pid 30137] (70014)End of file found: AH01030: ajp_ilink_receive() can't receive header
[Sat Dec 26 14:10:34.420498 2020] [proxy_ajp:error] [pid 30137] [client] AH00992: ajp_read_header: ajp_ilink_receive failed
[Sat Dec 26 14:10:34.420506 2020] [proxy_ajp:error] [pid 30137] (120006)APR does not understand this error code: [client] AH00878: read response failed from (localhost)



To prevent this from happening the following steps should be performed:
  • Create a backup of /etc/tomcat/server.xml
  • In /etc/tomcat/server.xml look for the following string:
  <Service name="Catalina">
  • Change the value for connectionTimeout to "600000"
  • For SUSE Manager 4.1 it should look like :
    <Connector URIEncoding="UTF-8" address="" connectionTimeout="600000" maxThreads="150" port="8009" protocol="AJP/1.3" redirectPort="8443" secretRequired="false"/>
    <Connector URIEncoding="UTF-8" address="::1" connectionTimeout="600000" maxThreads="150" port="8009" protocol="AJP/1.3" redirectPort="8443" secretRequired="false"/>

Note: maxThreads may have a different value, depending on the configuration, this value should not be changed.

  • Restart of the SUSE Manager server with: spacewalk-service restart


AJP is a TCP-based protocol for fast communication between apache and tomcat and is used at every HTTP request that involves the Java stack. There is an optional watchdog mechanism to kill AJP connections if they are inactive for too long. The JVM might not respond to such keepalive messages if it is too busy or during garbage collection pauses. The keepalive time may be configured via the keepAliveTimeout option found in /etc/tomcat/server.xml. For more information please see:


Reported to Engineering


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  • Document ID:000019835
  • Creation Date: 04-Feb-2021
  • Modified Date:04-Feb-2021
    • SUSE Manager for Retail
    • SUSE Manager Server

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