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Knowledge Base

Watch4Net | SRM: Non-ASCII UTF-8 characters used in email subject line causes corrupt character encoding (518878)

Last Updated: 5/29/2020Categories: TroubleshootingTotal Views: 6050Language:
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Symptoms

Non-ASCII UTF-8 characters used in email subject line causes corrupt character encoding. For example, the entering the following subject line into the email subject field for any mailed report can yield the corrupt output shown below:

Input String:

Traffic MPLS IN/OUT - R seau admin (toutes les interfaces) - Liens WAN / Traffic MPLS IN/OUT - R seau admin (toutes les interfaces)

Corrupted Output String:

=?ANSI_X3.4-1968?Q?Traffic_MPLS_IN/OUT_-_R=3Fseau_adm?= =?ANSI_X3.4-1968?Q?in_(toutes_les_interfaces)_-_Lien?= =?ANSI_X3.4-1968?Q?s_WAN_/_Traffic_MPLS_IN/OUT_-_R=3Fs?= =?ANSI_X3.4-1968?Q?eau_admin_(toutes_les_interfaces)?=

In this case, the non-ASCII UTF-8 character that was used in the subject line is the accented letter 'e' ( ). Other non-ASCII UTF-8 characters will cause the same effect. A common one is the em-dash ( ) that many word processors automatically substitute in place of a hyphen (-) in a sentence without the user's knowledge because it is so difficult to tell the difference between an em-dash and a hyphen.

Cause

The application defaults to the character encoding observed on the host system. If the character encoding configured on the host system changes (ex.: a kernel update or other configuration change), UTF-8 may no longer be the default encoding that would typically be required to display the full range of UTF-8 characters.

Resolution

To resolve this issue, do as follows:

1.   Open the following file on the front end host in question in a text editor (preferably one that uses UTF-8 as the native character encoding scheme - ex.: vi on Linux hosts where the host is configured for UTF-8 base character encoding, or a plain text editor like Notepad++) for editing:

{W4N Home Install Path}/bin/apg.properties

2.   Locate the "mail.smtp.host" parameter (in the Common Properties section)
3.   Insert a blank line below it, then enter the following parameter and value into the newly inserted blank line:

mail.mime.charset=UTF-8

For example:

#===================

# Common Properties

#===================

hostname=apg.w4n-support-lab-front-end.local

mail.smtp.host=localhost

mail.mime.charset=UTF-8

com.watch4net.master.password.digest=true

4.   Save and exit the file.
5.   Restart the services on the front end host using the following command:

{W4N Home Install Path}/bin/manage-modules.sh service restart all

This will configure the application with an explicit character encoding value to use in composing e-mail that should be picked up and used to populate e-mail subject line as an embedded header.

Related Information

Note: the same change can be applied on the apg.properties file of a backend server where the alerting backend resides to ensure email alerts contain correct character encoding also.

Detectable by VMware SkylineTM

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