curl error 60

There could be a number of causes related to that error. The main cause relates to SSL verification so my first guess would be that something is preventing the plugin from communicating with dropbox like a firewall on the host/server.

What is the best way i can get it solved. Any suggestions please

I would contact the host where your site is located and ask them if the connection is being stopped by anything.

Is the pic i am uploading being directly uploaded into dropbox? or first saved into a directory and then moved into dropbox.

When you say connection, are you talking about “Dropbox connection”?

When you upload a file, its being saved in a folder on your host then loaded into memory and sent to dropbox.

“Is it the connection being established with dropbox” Thats what you need to ask the hosting company. Tell them the error your getting and they should be able to help you.

Is there a way i can pinpoint the issue by doing echo or something?

When i tried to change PhPAuth it is giving Error: Internal Server Error!
Dose that mean it is causing due to firewall settings for Dropbox.

Its possible that the problem is caused by a firewall. Do you have a plugin called Backup to Dropbox by chance? That plugin is known to conflict with this plugin which could also be causing the issue.

Nope i do not have Backup to Dropbox plugin installed. i will try to contact system admin and ask him to give access to dropbox website in the firewall settings.

Do i have to open https(443) port of my server to enable access to dropbox for this plugin?. Currently it seems it is closed.

Yes port 443 outgoing should be open

It seems the 443 outgoing port is open, but below is my php error log

[29-Apr-2014 19:29:50 UTC] PHP Warning: unlink(D:\xxxxx/wp-content/uploads/wpdb/cropped-1260x240px_h004_5027_2014-04-29.jpg): Permission denied in D:\xxxx\wp-content\plugins\simple-dropbox-upload-form\wp-dropbox.php on line 350
[29-Apr-2014 19:32:07 UTC] PHP Warning: unlink(D:\xxxxx/wp-content/uploads/wpdb/cropped-1260x240px_h004_7105_2014-04-29.jpg): Permission denied in D:\xxxx\wp-content\plugins\simple-dropbox-upload-form\wp-dropbox.php on line 350
[29-Apr-2014 19:32:36 UTC] PHP Warning: unlink(D:\xxxxx/wp-content/uploads/wpdb/Header_Summer1_8193_2014-04-29.jpg): Permission denied in D:\xxxx\wp-content\plugins\simple-dropbox-upload-form\wp-dropbox.php on line 350
[29-Apr-2014 19:35:29 UTC] PHP Warning: unlink(D:\xxxxx/wp-content/uploads/wpdb/2013-07-31_16_8346_2014-04-29.jpg): Permission denied in D:\xxxx\wp-content\plugins\simple-dropbox-upload-form\wp-dropbox.php on line 350

Do you think this error is bcoz of permissions to write or delete uploaded file in the server?