PHP Warning: DOMDocument::schemaValidate(http://www.w3.org/Math/XMLSchema/mathml3/mathml3-content.xsd): failed to open stream

Hi,

I found the following PHP warnings for the first time. Although we ignore most of the warning messages in PHP error log yet I am posting here if someone can tell me about these warnings:

[23-Apr-2020 21:18:59 UTC] PHP Warning: DOMDocument::schemaValidate(http://www.w3.org/Math/XMLSchema/mathml3/mathml3-content.xsd): failed to open stream: HTTP request failed! in /home/seisense/journal.seisense.com/lib/pkp/classes/xslt/XMLTypeDescription.inc.php on line 134
[23-Apr-2020 21:18:59 UTC] PHP Warning: DOMDocument::schemaValidate(): Invalid Schema in /home/seisense/journal.seisense.com/lib/pkp/classes/xslt/XMLTypeDescription.inc.php on line 134
[23-Apr-2020 21:18:59 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/seisense/journal.seisense.com/lib/pkp/plugins/generic/acron/PKPAcronPlugin.inc.php:217) in /home/seisense/journal.seisense.com/lib/pkp/classes/plugins/ImportExportPlugin.inc.php on line 156

Server Information

OJS 3.2.0.2

Setting Name Setting Value
OS platform Linux
PHP version 7.2.30
Apache version Apache
Database driver mysqli
Database server version 10.3.22-MariaDB

Thanks

Hi @seisense,

Is your server blocked or firewalled from accessing http://www.w3.org/Math/XMLSchema/mathml3/mathml3-content.xsd?

Regards,
Alec Smecher
Public Knowledge Project Team

Hi @asmecher,
I am told by the host that the server is not blocking or behind the firewall from accessing http://www.w3.org/Math/XMLSchema/mathml3/mathml3-content.xsd?
Now, its more than 24 hours, I did not receive this error again.
Thanks

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