API upload fails. Can not connect to api-content.dropbox.com for 32-th chunk

[Gelembjuk]

I use the dropbox API to upload files.

It is latest API version.

Uploading is with chunks of 20MB .

Recently it stopped to work for big files. I notices it stops to work at chunk 32 .

All chunks before this are fine. 

And then on nex chunk my script can not connect to to dropbox server

TCP connect to api-content.dropbox.com on a port 443 can not be established. It doesn't fail. It just hungs at connecting (and my timeout 5 sec doesn't affect)

What can it be? Any ideas?

[Greg-DB]

The Dropbox API content servers are currently be served properly, and I'm currently able to upload more than 32 20MB-chunks, so it might be an issue with your network connection (or ISP). For example, is there something, such as security software like an anti-virus or firewall, or a malfunctioning proxy, that may be interfering with the connection?

[Gelembjuk · Accepted solution]

I have found the workaround .

The reason for this problem is some bug in my system libs or in perl modules. 

It is totally not related to dropbox . 

My Perl code was

$socket = new IO::Socket::SSL(PeerAddr => $host,PeerPort => 443,Timeout=>5); 

But because some bug it hungs after 32 connects (each previous socket was closed)

The fix is to set the option to verify certificate

$socket=new IO::Socket::SSL(PeerAddr => $host,PeerPort => 443,Timeout=>5,SSL_verify_mode => SSL_VERIFY_NONE);

This solves the problem.

Again, it is not related to dropbox. It happens for any SSL connection to other servers too 

[Greg-DB]

I'm glad to hear you got this working, but note that disabling SSL certificate verification is not recommended, as that may introduce certain kinds of security vulnerabilities.