OJS Dashboard Pages Not Showing

We are using running OJS on RHEL 8.5. Recently and without seemingly any reason (we made no system level changes) some pages from the Dashboard (like the “Administration” link) are not displaying — we are seeing 500 errors and or white webpages.

The PHP error is:
"18-Apr-2023 13:16:59 UTC] PHP Fatal error: Uncaught GuzzleHttp\Exception\ClientException: Client error: GET http://pkp.sfu.ca/ojs/xml/ojs-version.xml?id=631f837dbf6c9&oai=https%3A%2F%2Fjournals.towson.edu%2Findex.php%2Findex%2Foai resulted in a 403 Forbidden response:

<meta type="copy (truncated...) in /var/www/html/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:113 Stack trace: #0 /var/www/html/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Middleware.php(65): GuzzleHttp\Exception\RequestException::create() #1 /var/www/html/lib/pkp/lib/vendor/guzzlehttp/promises/src/Promise.php(204): GuzzleHttp\Middleware::GuzzleHttp\{closure}() #2 /var/www/html/lib/pkp/lib/vendor/guzzlehttp/promises/src/Promise.php(153): GuzzleHttp\Promise\Promise::callHandler() #3 /var/www/html/lib/pkp/lib/vendor/guzzlehttp/promises/src/TaskQueue.php(48): GuzzleHttp\Promise\Promise::GuzzleHttp\Promise\{closure}() #4 /var/www/html/lib/pkp/lib/vendor/guzzleh in /var/www/html/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php on line 113"

This has happened to us before and our enterprise firewall/proxy was blocking OJS from checking the OJS version. It was fixed by adjusting our proxy server values in the config file. This looks like the same thing but now it’s a GET error when previously we got a cURL error.

We suspect something’s a miss on our enterprise firewall/proxy but I wanted to make sure I understand what’s happening and make sure it isn’t something we can correct for. Thanks in advance!

So it seems our OJS server was accidentally deleted from the our enterprise web proxy’s permit list. Our enterprise group has resolved this. As always thanks for all your help!