Hi,

A few days ago, I asked to my hosting company if my server was OK for the new Paypal changes (Paypal sent me an e-mail telling me that I should check them all):

TLS 1.2 HTTP/1.1 requirement
HTTPS requirement for IPN Postback
Discontinue GET Method for Classic API
etc.

They told me that my server was too old, and they offered me to change to a new one. I accepted. After the change of server, the store had two problems:

1) Some characters didn't show properly
2) The sessions expired immediately, after clicking at any link of the store (so checkout is impossible).

I though it would be a good excuse to upgrade my store to the last version, so I proceed.
The character set problem was solved, but the expired session problem was still there.

After that, I decided to install a clean new copy of ZC, with a default database, and the expired session problem persists. No addons, no templates, no changes in code (just both configuration.php files).

I don't know what to do. Any help would be appreciated. Server and ZC versions below.
Thank you in advance!
Xavier.

Server data:

Server Host: comp22.cyberneticos.com (164.138.208.220)Server OS: Linux 2.6.32-673.8.1.lve1.4.3.1.el6.x86_64 Server Date: 07/25/2016 16:23:13 Server Up Time: 16:23:13 up 33 days, 4:39, 0 users, load average: 1.18, 1.11, 1.14HTTP Server: Apache/2PHP Version: 5.6.16 (Zend: 2.6.0)PHP File Uploads: OnUpload Max Size: 2MPHP Memory Limit: 128MPOST Max Size: 8MDatabase: MySQL 10.0.26-MariaDBDatabase Host: localhost (127.0.0.1)Database Date: 07/25/2016 16:23:13Database Data Size: 507 kBDatabase Index Size: 640 kBMySQL Slow Query Log Status: OnMySQL Slow Query Log File: comp22-slow.logMySQL Mode: (None set)

Zen Cart 1.5.5a
Database Patch Level: 1.5.5
v1.5.5a [2016-07-25 13:54:42] (New Installation-v155a)
v1.5.5a [2016-07-25 13:54:42] (New Installation-v155a)