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7 Known issues

Global event correlation

Events may not get correlated correctly if the time interval between the first and second event is very small, i.e. half a second and less.

IPMI checks

IPMI checks will not work with the standard OpenIPMI library package on Debian prior to 9 (stretch) and Ubuntu prior to 16.04 (xenial). To fix that, 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.

XML data queried from Microsoft SQL Server may get truncated in various ways on Linux and UNIX systems.

Incorrect request method parameter in items

The request method parameter, used only in HTTP checks, may be incorrectly set to '1', a non-default value for all items as a result of upgrade from a pre-4.0 Áú»¢¶Ä²© version. For details on how to fix this situation, see .

HTTPS checks

Web scenarios and HTTP agent items using the https protocol, 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.

Web monitoring and HTTP agent

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 or HTTP agent. Please see for more information and available workarounds.

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.

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. A local patch for the net-snmp package on OpenBSD was applied and will be released with OpenBSD 6.3.

Alerter process crash in Centos/RHEL 7

Instances of a Áú»¢¶Ä²© server alerter process crash have been encountered in Centos/RHEL 7. Please see for details.

Flipping frontend locales

It has been observed that frontend locales may flip without apparent logic. A known workaround to this is to disable multithreading in PHP and Apache. Please see for more information.

Compatibility issue with PHP 7.0

It has been observed that with PHP 7.0 importing a template with web monitoring triggers may fail due to incorrectly added double quotes to the web monitoring items in the trigger expressions. The issue goes away when upgrading PHP to 7.1.

PHP 7.3 opcache configuration

If "opcache" is enabled in the PHP 7.3 configuration, Áú»¢¶Ä²© frontend may show a blank screen when loaded for the first time. This is a registered . To work around this, please set the "opcache.optimization_level" parameter to 0x7FFFBFDF in the PHP configuration (php.ini file).

Graphs

Changes to Daylight Saving Time (DST) result in irregularities when displaying X axis labels (date duplication, date missing, etc).

Log file monitoring

log[] and logrt[] items repeatedly reread log file from the beginning if file system is 100% full and the log file is being appended (see for more information).

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 .

API

The output parameter does not work properly with the history.get method (fixed in 4.2.5).

API login

A large number of open user sessions can be created when using custom scripts with the user.login method without a following user.logout.

IPv6 address issue in SNMPv3 traps

Due to a net-snmp bug, IPv6 address may not be correctly displayed when using SNMPv3 in SNMP traps. For more details and a possible workaround, see .

Trimmed long IPv6 IP address in failed login information

Failed login attempt message will display only the first 39 characters of a stored IP address as that's the character limit in the database field. That means that IPv6 IP addresses longer than 39 characters will be shown incompletely.

IE11 issue with map resizing in dashboard widgets

Maps, in Internet Explorer 11, are cut off on the right side if the map content is larger than the dashboard widget area (instead of being resized proportionately). This is intentional because of an IE11-related issue with proper resizing of SVG images.

Known issues in 4.2.0, 4.2.1

• IPMI pollers are unable to process more than 60 items per minute. Fixed in 4.2.2.
• You may encounter the issue of 100% CPU usage by IPMI pollers if using OpenIPMI version 2.0.26 and above. Fixed in 4.2.2.

Known issues in 4.2.2

• This version requires write permissions to the assets directory for the web server user. This requirement, however, would break those installations of the frontend where the web server has no write permissions to the document root (see for details). As a result, this requirement is rolled back in 4.2.3.