Error when adding a new block to the plugins database

<r><p>Anybody else having problems registering a new block in the pluginsdatabase?"There’s a temporary connection error on our side, so your plugin can’t be submitted right now. Please try again later."</p> <HR>---</HR> <H3><s>### </s>&#129302; الحل الهندسي المقترح:</H3> <p><STRONG><s>**</s>Title:<e>**</e></STRONG> Moodle Plugin External Connectivity Troubleshooting (Error: "Temporary connection error on our side")</p> <p><STRONG><s>**</s>Problem Statement:<e>**</e></STRONG><br/> Users encounter an error message: "There’s a temporary connection error on our side, so your plugin can’t be submitted right now. Please try again later." when Moodle attempts to interact with external plugin services, such as <C><s>`</s>moodle.org<e>`</e></C>'s Plugins directory. This typically occurs during operations like installing a new block or plugin via the Moodle UI, checking for plugin updates, or similar functions requiring outbound HTTP/HTTPS connections. This error indicates that the Moodle server itself is failing to establish a connection to the required external service.</p> <p><STRONG><s>**</s>Applies To:<e>**</e></STRONG> Moodle instances running on Linux servers.</p> <p><STRONG><s>**</s>Severity:<e>**</e></STRONG> Medium - High (blocks essential plugin management functionality and potential security updates).</p> <p><STRONG><s>**</s>Prerequisites:<e>**</e></STRONG></p> <LIST><LI><s>* </s>SSH access to the Moodle server with root or sudo privileges.</LI> <LI><s>* </s>Moodle administrator credentials.</LI> <LI><s>* </s>Basic familiarity with Linux command-line operations (e.g., <C><s>`</s>curl<e>`</e></C>, <C><s>`</s>ping<e>`</e></C>, <C><s>`</s>dig<e>`</e></C>, <C><s>`</s>systemctl<e>`</e></C>, text editors).</LI></LIST> <HR>---</HR> <H3><s>### </s><STRONG><s>**</s>Standard Operating Procedure (SOP): Moodle Plugin External Connectivity Troubleshooting<e>**</e></STRONG></H3> <p><STRONG><s>**</s>Objective:<e>**</e></STRONG> To diagnose and resolve the "Temporary connection error on our side" when Moodle attempts to interact with external plugin databases.</p> <p><STRONG><s>**</s>Estimated Time:<e>**</e></STRONG> 30-60 minutes, depending on the complexity of the issue.</p> <HR>---</HR> <p><STRONG><s>**</s>Step 1: Initial Triage &amp; Network Connectivity Verification (Linux CLI)<e>**</e></STRONG></p> <p>This step verifies the fundamental network reachability from your Moodle server to external services.</p> <LIST type="decimal"><LI><s>1. </s><p><STRONG><s>**</s>Check DNS Resolution:<e>**</e></STRONG></p> <LIST><LI><s>* </s>Open your terminal and connect to the Moodle server via SSH.</LI> <LI><s>* </s>Test DNS resolution for <C><s>`</s>moodle.org<e>`</e></C>: <CODE lang="bash"><s> ```bash</s><i> </i> dig moodle.org ping -c 4 moodle.org<i> </i><e> ```</e></CODE></LI> <LI><s>* </s><STRONG><s>**</s>Expected Outcome:<e>**</e></STRONG> <C><s>`</s>dig<e>`</e></C> should return one or more IP addresses for <C><s>`</s>moodle.org<e>`</e></C>. <C><s>`</s>ping<e>`</e></C> should show successful replies.</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> If DNS resolution fails (<C><s>`</s>Host not found<e>`</e></C>, <C><s>`</s>Temporary failure in name resolution<e>`</e></C>), check <C><s>`</s>/etc/resolv.conf<e>`</e></C> for correct DNS server entries or consult your network administrator.</LI></LIST></LI> <LI><s>2. </s><p><STRONG><s>**</s>Test Outbound HTTP/HTTPS Connectivity with <C><s>`</s>curl<e>`</e></C>:<e>**</e></STRONG></p> <LIST><LI><s>* </s>Use <C><s>`</s>curl<e>`</e></C> to simulate Moodle's attempt to connect to the Moodle plugins directory: <CODE lang="bash"><s> ```bash</s><i> </i> curl -v https://moodle.org/plugins/<i> </i><e> ```</e></CODE></LI> <LI><s>* </s><STRONG><s>**</s>Expected Outcome:<e>**</e></STRONG> The command should show a successful connection (<C><s>`</s>Connected to moodle.org<e>`</e></C>), SSL handshake, and a successful HTTP 200 OK response (or similar success code).</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> <LIST><LI><s>* </s><STRONG><s>**</s><C><s>`</s>Could not resolve host<e>`</e></C><e>**</e></STRONG>: DNS issue (refer to Step 1.1).</LI> <LI><s>* </s><STRONG><s>**</s><C><s>`</s>Connection refused<e>`</e></C><e>**</e></STRONG>: Often indicates a firewall on the remote end or an incorrect port.</LI> <LI><s>* </s><STRONG><s>**</s><C><s>`</s>Connection timed out<e>`</e></C><e>**</e></STRONG>: Indicates a network path issue or a firewall blocking outbound connections from your server.</LI> <LI><s>* </s><STRONG><s>**</s><C><s>`</s>SSL_ERROR_SYSCALL<e>`</e></C>, <C><s>`</s>SSL certificate problem<e>`</e></C><e>**</e></STRONG>: This is a very common issue and points to problems with your server's CA certificate bundle (see Step 2.3).</LI> <LI><s>* </s><STRONG><s>**</s>No response or very slow response<e>**</e></STRONG>: Could indicate network congestion or an active firewall blocking the connection.</LI></LIST></LI></LIST></LI> <LI><s>3. </s><p><STRONG><s>**</s>Check Local Firewall Rules:<e>**</e></STRONG></p> <LIST><LI><s>* </s>Verify that your server's firewall is not blocking outbound connections on ports 80 (HTTP) and 443 (HTTPS).</LI> <LI><s>* </s><STRONG><s>**</s>For <C><s>`</s>firewalld<e>`</e></C> (CentOS/RHEL 7+):<e>**</e></STRONG> <CODE lang="bash"><s> ```bash</s><i> </i> sudo firewall-cmd --list-all<i> </i><e> ```</e></CODE> Look for <C><s>`</s>ports<e>`</e></C> or <C><s>`</s>services<e>`</e></C> that explicitly allow outbound traffic on 80/443, or ensure there are no <C><s>`</s>reject<e>`</e></C> rules for outbound traffic.</LI> <LI><s>* </s><STRONG><s>**</s>For <C><s>`</s>UFW<e>`</e></C> (Ubuntu/Debian):<e>**</e></STRONG> <CODE lang="bash"><s> ```bash</s><i> </i> sudo ufw status<i> </i><e> ```</e></CODE> Ensure there are no rules explicitly denying outbound connections to ports 80/443.</LI> <LI><s>* </s><STRONG><s>**</s>For <C><s>`</s>iptables<e>`</e></C> (older systems or custom configs):<e>**</e></STRONG> <CODE lang="bash"><s> ```bash</s><i> </i> sudo iptables -L -n<i> </i><e> ```</e></CODE> Review the <C><s>`</s>OUTPUT<e>`</e></C> chain for any rules that might be blocking outbound traffic.</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> If you find rules blocking outbound HTTP/HTTPS, temporarily disable them for testing or add explicit allow rules (e.g., <C><s>`</s>sudo ufw allow out to any port 80,443<e>`</e></C>). Remember to re-enable/re-secure your firewall afterward.</LI></LIST></LI> <LI><s>4. </s><p><STRONG><s>**</s>Check System-wide Proxy Settings (if applicable):<e>**</e></STRONG></p> <LIST><LI><s>* </s>If your organization uses a proxy server, ensure it's correctly configured at the OS level.</LI> <LI><s>* </s>```bash<i> </i> env | grep -i proxy<br/> cat /etc/environment<i> </i> ```</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> Incorrect or non-functional proxy settings can prevent outbound connections. Consult your network administrator if a proxy is required.</LI></LIST></LI></LIST> <HR>---</HR> <p><STRONG><s>**</s>Step 2: Moodle &amp; PHP Configuration Checks<e>**</e></STRONG></p> <p>This step focuses on Moodle-specific and PHP environment configurations that impact outbound connections.</p> <LIST type="decimal"><LI><s>1. </s><p><STRONG><s>**</s>Review Moodle <C><s>`</s>config.php<e>`</e></C> for Proxy Settings:<e>**</e></STRONG></p> <LIST><LI><s>* </s>Examine your Moodle's main configuration file.</LI> <LI><s>* </s>```bash<i> </i> cat /path/to/moodle/config.php | grep -i proxy<i> </i> ```<br/> <EM><s>*</s>(Replace <C><s>`</s>/path/to/moodle<e>`</e></C> with your actual Moodle installation directory)<e>*</e></EM></LI> <LI><s>* </s>Look for any <C><s>`</s>$CFG-&gt;proxyhost<e>`</e></C>, <C><s>`</s>$CFG-&gt;proxyport<e>`</e></C>, etc.</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> If proxy settings are defined here, ensure they are correct and match your network's requirements. Incorrect settings will cause connection failures.</LI></LIST></LI> <LI><s>2. </s><p><STRONG><s>**</s>Check Moodle HTTP Proxy Settings (Moodle UI):<e>**</e></STRONG></p> <LIST><LI><s>* </s>Log in to Moodle as an administrator.</LI> <LI><s>* </s>Navigate to <C><s>`</s>Site administration &gt; Server &gt; HTTP<e>`</e></C>.</LI> <LI><s>* </s>Examine the <C><s>`</s>Web proxy host<e>`</e></C> and <C><s>`</s>Web proxy port<e>`</e></C> settings.</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> If these are configured, ensure they are correct and the proxy server is functional. Try temporarily disabling them, saving changes, and retesting the plugin operation if you suspect the proxy.</LI></LIST></LI> <LI><s>3. </s><p><STRONG><s>**</s>Verify PHP cURL and OpenSSL Configuration:<e>**</e></STRONG></p> <LIST><LI><s>* </s><p>Moodle relies on PHP's cURL extension for HTTP requests, which uses OpenSSL for HTTPS.</p></LI> <LI><s>* </s><p><STRONG><s>**</s>a. Verify cURL Extension:<e>**</e></STRONG></p> <CODE lang="bash"><s> ```bash</s><i> </i> php -m | grep curl<i> </i><e> ```</e></CODE> <LIST><LI><s>* </s><STRONG><s>**</s>Expected Outcome:<e>**</e></STRONG> <C><s>`</s>curl<e>`</e></C> should be listed.</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> If <C><s>`</s>curl<e>`</e></C> is not listed, it means the PHP cURL extension is missing or not enabled. Install it using your distribution's package manager (e.g., <C><s>`</s>sudo apt install php-curl<e>`</e></C> for Debian/Ubuntu or <C><s>`</s>sudo yum install php-curl<e>`</e></C> for RHEL/CentOS) and restart your web server/PHP-FPM.</LI></LIST></LI> <LI><s>* </s><p><STRONG><s>**</s>b. Check CA Certificate Bundle (CRITICAL for SSL Errors):<e>**</e></STRONG></p> <LIST><LI><s>* </s>A common cause for "SSL certificate problem" errors from <C><s>`</s>curl<e>`</e></C> is an outdated or incorrectly configured CA (Certificate Authority) certificate bundle. <CODE lang="bash"><s> ```bash</s><i> </i> php -i | grep -E "curl.cainfo|openssl.cafile"<i> </i><e> ```</e></CODE></LI> <LI><s>* </s><STRONG><s>**</s>Expected Outcome:<e>**</e></STRONG> These directives should point to a valid and current CA certificate bundle file on your system (e.g., <C><s>`</s>/etc/ssl/certs/ca-certificates.crt<e>`</e></C> on Debian/Ubuntu, or <C><s>`</s>/etc/pki/tls/certs/ca-bundle.crt<e>`</e></C> on RHEL/CentOS).</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> <LIST><LI><s>* </s><STRONG><s>**</s>Missing or Incorrect Path:<e>**</e></STRONG> If the paths are empty or point to a non-existent file, you need to configure them in your <C><s>`</s>php.ini<e>`</e></C> file. <LIST><LI><s>* </s>Locate your <C><s>`</s>php.ini<e>`</e></C> (e.g., <C><s>`</s>php --ini<e>`</e></C> to find it).</LI> <LI><s>* </s>Edit <C><s>`</s>php.ini<e>`</e></C> and add/uncomment these lines, pointing to your system's CA bundle: <CODE lang="ini"><s> ```ini</s><i> </i> ; In php.ini curl.cainfo = "/etc/ssl/certs/ca-certificates.crt" ; Or your system's CA bundle path openssl.cafile = "/etc/ssl/certs/ca-certificates.crt" ; Same path<i> </i><e> ```</e></CODE></LI></LIST></LI> <LI><s>* </s><STRONG><s>**</s>Outdated CA Bundle:<e>**</e></STRONG> Even if the path is correct, the bundle might be outdated. Update it: <CODE lang="bash"><s> ```bash</s><i> </i> sudo update-ca-certificates # For Debian/Ubuntu sudo yum update ca-certificates # For RHEL/CentOS<i> </i><e> ```</e></CODE></LI> <LI><s>* </s>After any <C><s>`</s>php.ini<e>`</e></C> changes or <C><s>`</s>php-curl<e>`</e></C> installation, <STRONG><s>**</s>restart your web server and PHP-FPM service:<e>**</e></STRONG> <CODE lang="bash"><s> ```bash</s><i> </i> sudo systemctl restart php-fpm # or php7.x-fpm, php8.x-fpm sudo systemctl restart apache2 # or httpd sudo systemctl restart nginx<i> </i><e> ```</e></CODE></LI></LIST></LI></LIST></LI></LIST></LI></LIST> <HR>---</HR> <p><STRONG><s>**</s>Step 3: Moodle System Health &amp; Logs<e>**</e></STRONG></p> <LIST type="decimal"><LI><s>1. </s><p><STRONG><s>**</s>Moodle Health Check (CLI):<e>**</e></STRONG></p> <LIST><LI><s>* </s>Run Moodle's command-line health check tool: <CODE lang="bash"><s> ```bash</s><i> </i> php /path/to/moodle/admin/cli/health_check.php<i> </i><e> ```</e></CODE> <LIST><LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> Address any warnings or errors reported, especially those related to environment or PHP settings.</LI></LIST></LI></LIST></LI> <LI><s>2. </s><p><STRONG><s>**</s>Review Moodle System Logs (Moodle UI):<e>**</e></STRONG></p> <LIST><LI><s>* </s>Log in to Moodle as an administrator.</LI> <LI><s>* </s>Navigate to <C><s>`</s>Site administration &gt; Reports &gt; Logs<e>`</e></C>.</LI> <LI><s>* </s>Filter by 'admin' or 'system' components and look for related errors around the time the issue occurred.</LI></LIST></LI> <LI><s>3. </s><p><STRONG><s>**</s>Examine Web Server and PHP-FPM Error Logs (Linux CLI):<e>**</e></STRONG></p> <LIST><LI><s>* </s>Check your web server's error logs and PHP-FPM logs for any specific errors related to network connections, cURL, or OpenSSL.</LI> <LI><s>* </s><STRONG><s>**</s>Apache:<e>**</e></STRONG> <C><s>`</s>/var/log/apache2/error.log<e>`</e></C> (Debian/Ubuntu) or <C><s>`</s>/var/log/httpd/error_log<e>`</e></C> (RHEL/CentOS)</LI> <LI><s>* </s><STRONG><s>**</s>Nginx:<e>**</e></STRONG> <C><s>`</s>/var/log/nginx/error.log<e>`</e></C></LI> <LI><s>* </s><STRONG><s>**</s>PHP-FPM:<e>**</e></STRONG> Often in <C><s>`</s>/var/log/php-fpm/www-error.log<e>`</e></C> or similar, depending on your PHP-FPM pool configuration.</LI> <LI><s>* </s><STRONG><s>**</s>Troubleshooting:<e>**</e></STRONG> Look for messages containing <C><s>`</s>curl<e>`</e></C>, <C><s>`</s>ssl<e>`</e></C>, <C><s>`</s>http<e>`</e></C>, <C><s>`</s>connection<e>`</e></C>, <C><s>`</s>failed to connect<e>`</e></C>, <C><s>`</s>timeout<e>`</e></C>. These logs often provide more detailed error messages than Moodle's UI.</LI></LIST></LI></LIST> <HR>---</HR> <p><STRONG><s>**</s>Step 4: Confirm Plugin Installation Status (If applicable)<e>**</e></STRONG></p> <LIST type="decimal"><LI><s>1. </s>If you were attempting to install a new block, navigate to <C><s>`</s>Site administration &gt; Plugins &gt; Blocks overview<e>`</e></C>.</LI> <LI><s>2. </s>Check if the block is listed. Even if it has an error status, its presence confirms Moodle recognized the files (if manually installed). The issue is with the external connection step.</LI></LIST> <HR>---</HR> <p><STRONG><s>**</s>Step 5: Temporary Workaround (If Urgent)<e>**</e></STRONG></p> <LIST type="decimal"><LI><s>1. </s>If the primary goal is to install a specific block or plugin and the in-Moodle installer continues to fail due to this connectivity issue, you can perform a manual installation.</LI> <LI><s>2. </s><STRONG><s>**</s>Download the plugin:<e>**</e></STRONG> Go to <C><s>`</s>moodle.org/plugins<e>`</e></C> and manually download the plugin ZIP file to your local machine.</LI> <LI><s>3. </s><STRONG><s>**</s>Upload to server:<e>**</e></STRONG> Transfer the ZIP file to your Moodle server (e.g., using <C><s>`</s>scp<e>`</e></C> or <C><s>`</s>sftp<e>`</e></C>).</LI> <LI><s>4. </s><STRONG><s>**</s>Extract:<e>**</e></STRONG> Extract the plugin into the appropriate directory within your Moodle installation (e.g., for a block, <C><s>`</s>/path/to/moodle/blocks/<e>`</e></C>). Ensure the directory name matches the plugin's folder name within the ZIP.</LI> <LI><s>5. </s><STRONG><s>**</s>Set permissions:<e>**</e></STRONG> Ensure correct file ownership and permissions for the new plugin directory and files (e.g., <C><s>`</s>chown -R www-data:www-data /path/to/moodle/blocks/your_plugin_name<e>`</e></C> and <C><s>`</s>chmod -R 0755 /path/to/moodle/blocks/your_plugin_name<e>`</e></C>).</LI> <LI><s>6. </s><STRONG><s>**</s>Trigger installation:<e>**</e></STRONG> Navigate to <C><s>`</s>Site administration &gt; Notifications<e>`</e></C> in your Moodle UI. Moodle will detect the new plugin files and prompt you to install/upgrade it.</LI></LIST> <p><STRONG><s>**</s>Note:<e>**</e></STRONG> This workaround bypasses the in-Moodle download mechanism but does not fix the underlying external connectivity issue. It's crucial to still resolve the core problem as it might affect future updates and other Moodle functionalities.</p> <HR>---</HR> <p><STRONG><s>**</s>Resolution:<e>**</e></STRONG><br/> By following these steps, you should be able to identify and resolve the root cause of the "Temporary connection error on our side" error, which most commonly stems from network connectivity issues (DNS, firewall), or PHP's cURL/OpenSSL configuration, particularly the CA certificate bundle.</p></r>