Uncaught exception 'MongoDB\\Driver\\Exception\\ConnectionTimeoutException' with message 'No suitable servers found

[Gulab Pasha]

Hi Guys,

Help me on the following,

[Mon Sep 26 23:13:44.036909 2016] [:error] [pid 393] [client 49.207.53.70:24604] PHP Fatal error:  Uncaught exception 'MongoDB\\Driver\\Exception\\ConnectionTimeoutException' with message 'No suitable servers found (`serverselectiontryonce` set): [Failed connecting to 'localhost:27017': Permission denied]' in /var/www/html/api/dev/v1.0/vendor/mongodb/mongodb/src/Collection.php:187\nStack trace:\n#0 /var/www/html/api/dev/v1.0/vendor/mongodb/mongodb/src/Collection.php(187): MongoDB\\Driver\\Manager->selectServer(Object(MongoDB\\Driver\\ReadPreference))\n#1 /var/www/html/api/dev/v1.0/categories/index.php(79): MongoDB\\Collection->aggregate(Array)\n#2 /var/www/html/api/dev/v1.0/categories/index.php(19): CategoriesAPI->categoriesList('{??  "requestMe...')\n#3 {main}\n  thrown in /var/www/html/api/dev/v1.0/vendor/mongodb/mongodb/src/Collection.php on line 187

unable to track where the issue is.

Looking forward to your help

Thanks,

Gulab Pasha

[Jeremy Mikola]

The root error is "Failed connecting to 'localhost:27017': Permission denied", which appears after the generic message that server selection has failed (i.e. "No suitable servers found"). FYI: "serverselectiontryonce set" is just reporting the selection mode of libmongoc that the PHP driver uses (we try once because we do not have a thread for background monitoring).

"Failed connecting to 'localhost:27017': Permission denied" is a networking issue below the driver. Firewall settings on the local machine might also be a possible cause.

Some cursory searching on "permission denied connect error" mostly turns up support forums for Java applications, but more than a handful of posts indicated some IPv6 and IPv4 issue. It's possible that PHP is resolving "localhost" to an IPv6 address. On the off chance that is a problem, changing the connection URI to use an explicit IP address (e.g. "mongodb://127.0.0.1") may help.