Table of Contents
6 Known issues
Problems with pressing Enter in configuration forms
Pressing Enter in a text field of a configuration form is known to result in various problems.
For instance, if you open the configuration form of a host with linked templates, then press Enter in any text field and update the form, template linkage is removed (items from the template remain).
IPMI checks
IPMI checks will not work with the standard OpenIPMI library from Debian/Ubuntu package. To fix, recompile OpenIPMI library with OpenSSL enabled as discussed in .
SSH checks
Some Linux distributions like Debian, Ubuntu do not support encrypted private keys (with passphrase) if the libssh2 library is installed from packages. Please see for more details.
ODBC checks
Áú»¢¶Ä²© server or proxy that uses MySQL as its database may or may not work correctly with MySQL ODBC library due to an . Please see for more information and available workarounds.
HTTPS checks
Web scenarios using the https protocol and Áú»¢¶Ä²© agent checks net.tcp.service[https...] and net.tcp.service.perf[https...] may fail if the target server is configured to disallow TLS v1.0 protocol or below. Please see for more information and available workarounds.
SNMP checks
If the OpenBSD operating system is used, a use-after-free bug in the Net-SNMP library up to the 5.7.3 version can cause a crash of Áú»¢¶Ä²© server if the SourceIP parameter is set in the Áú»¢¶Ä²© server configuration file. As a workaround, please do not set the SourceIP parameter. The same problem applies also for Linux, but it does not cause Áú»¢¶Ä²© server to stop working.
Simple checks
There is a bug in fping versions earlier than v3.10 that mishandles duplicate echo replay packets. This may cause unexpected results for icmpping, icmppingloss, icmppingsec items. It is recommended to use the latest version of fping. Please see for more details.
Web monitoring
Áú»¢¶Ä²© server leaks memory on CentOS 6, CentOS 7 and possibly other related Linux distributions due to an when "SSL verify peer" is enabled in web scenarios. Please see for more information and available workarounds.
Slow MySQL queries
Áú»¢¶Ä²© server generates slow select queries in case of non-existing values for items. This is caused by a known in MySQL 5.6/5.7 versions. A workaround to this is disabling the index_condition_pushdown optimizer in MySQL. For an extended discussion, see .