ho confrontato le configurazioni dei due server, a me sembrano uguali.
Cmq il vaore true era indicativo. In realtà alla sessione assegno una stringa.


Server in cui le sessioni funzionano perfettamente:

Configuration
PHP Core
Directive Local Value Master Value
allow_call_time_pass_reference On On
allow_url_fopen On On
always_populate_raw_post_data Off Off
arg_separator.input & &
arg_separator.output & &
asp_tags Off Off
auto_append_file no value no value
auto_prepend_file no value no value
browscap no value no value
default_charset no value no value
default_mimetype text/html text/html
define_syslog_variables Off Off
disable_classes no value no value
disable_functions dl,exec,shell_exec,system,popen,pclose,proc_open,p roc_nice,proc_close,passthru,virtual,set_time_limi t,leak,chgrp,ini_alter,ini_restore,posix_kill,pcnt l_exec,pcntl_fork,pcntl_signal dl,exec,shell_exec,system,popen,pclose,proc_open,p roc_nice,proc_close,passthru,virtual,set_time_limi t,leak,chgrp,ini_alter,ini_restore,posix_kill,pcnt l_exec,pcntl_fork,pcntl_signal
display_errors On On
display_startup_errors Off Off
doc_root no value no value
docref_ext no value no value
docref_root no value no value
enable_dl On On
error_append_string no value no value
error_log error_log error_log
error_prepend_string no value no value
error_reporting 2039 2039
expose_php Off Off
extension_dir ./ ./
file_uploads On On
gpc_order GPC GPC
highlight.bg #FFFFFF #FFFFFF
highlight.comment #FF8000 #FF8000
highlight.default #0000BB #0000BB
highlight.html #000000 #000000
highlight.keyword #007700 #007700
highlight.string #DD0000 #DD0000
html_errors On On
ignore_repeated_errors Off Off
ignore_repeated_source Off Off
ignore_user_abort Off Off
implicit_flush Off Off
include_path .:/usr/lib/php:/usr/local/lib/php .:/usr/lib/php:/usr/local/lib/php
log_errors On On
log_errors_max_len 1024 1024
magic_quotes_gpc On On
magic_quotes_runtime Off Off
magic_quotes_sybase Off Off
max_execution_time 30 30
max_input_time -1 -1
open_basedir /home/pagespub/:/usr/lib/php:/usr/local/lib/php:/tmp no value
output_buffering no value no value
output_handler no value no value
post_max_size 55M 55M
precision 14 14
register_argc_argv On On
register_globals Off Off
report_memleaks On On
safe_mode Off Off
safe_mode_exec_dir no value no value
safe_mode_gid Off Off
safe_mode_include_dir no value no value
sendmail_from no value no value
sendmail_path /usr/sbin/sendmail -t -i /usr/sbin/sendmail -t -i
serialize_precision 100 100
short_open_tag On On
SMTP localhost localhost
smtp_port 25 25
sql.safe_mode Off Off
track_errors Off Off
unserialize_callback_func no value no value
upload_max_filesize 50 M 50 M
upload_tmp_dir no value no value
user_dir no value no value
variables_order EGPCS EGPCS
xmlrpc_error_number 0 0
xmlrpc_errors Off Off
y2k_compliance Off Off


Zend Optimizer
Optimization Pass 1 enabled
Optimization Pass 2 enabled
Optimization Pass 3 enabled
Optimization Pass 4 enabled
Optimization Pass 9 disabled
Zend Loader enabled
License Path no value


apache
APACHE_INCLUDE no value
APACHE_TARGET no value
Apache Version
Apache Release 10333100
Apache API Version 19990320
Hostname:Port www.pagespublic.com:80
User/Group nobody(99)/99
Max Requests Per Child: 40 - Keep Alive: off - Max Per Connection: 100
Timeouts Connection: 180 - Keep-Alive: 15
Server Root /usr/local/apache
Loaded Modules mod_evasive, mod_limitipconn, mod_security, mod_auth_passthrough, mod_log_bytes, mod_bwlimited, mod_php4, mod_frontpage, mod_ssl, mod_setenvif, mod_so, mod_expires, mod_auth, mod_access, mod_rewrite, mod_alias, mod_userdir, mod_actions, mod_imap, mod_asis, mod_cgi, mod_dir, mod_autoindex, mod_include, mod_status, mod_negotiation, mod_mime, mod_log_config, mod_env, http_core

Directive Local Value Master Value
child_terminate 0 0
engine 1 1
last_modified 0 0
xbithack 0 0


Apache Environment
Variable Value
DOCUMENT_ROOT /home/pagespub/public_html
HTTP_ACCEPT image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, application/x-shockwave-flash, */*
HTTP_ACCEPT_ENCODING gzip, deflate
HTTP_ACCEPT_LANGUAGE it
HTTP_CONNECTION Keep-Alive
HTTP_HOST www.pagespublic.com
HTTP_USER_AGENT Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Sgrunt|V109|299|S-1534671291|dial; snprtz|T30195624000300)
PATH /bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
REMOTE_ADDR 82.107.45.35
REMOTE_PORT 2364
SCRIPT_FILENAME /home/pagespub/public_html/info.php
SERVER_ADDR 63.247.92.41
SERVER_ADMIN webmaster@pagespublic.com
SERVER_NAME www.pagespublic.com
SERVER_PORT 80
SERVER_SIGNATURE no value
SERVER_SOFTWARE
GATEWAY_INTERFACE CGI/1.1
SERVER_PROTOCOL HTTP/1.1
REQUEST_METHOD GET
QUERY_STRING no value
REQUEST_URI /info.php
SCRIPT_NAME /info.php


HTTP Headers Information
HTTP Request Headers
HTTP Request GET /info.php HTTP/1.1
Accept image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, application/x-shockwave-flash, */*
Accept-Encoding gzip, deflate
Accept-Language it
Connection Keep-Alive
Host www.pagespublic.com
User-Agent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Sgrunt|V109|299|S-1534671291|dial; snprtz|T30195624000300)
HTTP Response Headers
Connection close
Transfer-Encoding chunked
Content-Type text/html


bcmath
BCMath support enabled


calendar
Calendar support enabled


ctype
ctype functions enabled


curl
CURL support enabled
CURL Information libcurl/7.12.0 OpenSSL/0.9.7a ipv6 zlib/1.2.1.2


domxml
DOM/XML enabled
DOM/XML API Version 20020815
libxml Version 20616
HTML Support enabled
XPath Support enabled
XPointer Support enabled
DOM/XSLT enabled
libxslt Version 1.1.8
libxslt compiled against libxml Version 2.6.11
DOM/EXSLT enabled
libexslt Version 1.1.8


ftp
FTP support enabled


gd
GD Support enabled
GD Version bundled (2.0.28 compatible)
FreeType Support enabled
FreeType Linkage with freetype
GIF Read Support enabled
GIF Create Support enabled
JPG Support enabled
PNG Support enabled
WBMP Support enabled
XBM Support enabled


gettext
GetText Support enabled


imap
IMAP c-Client Version 2001
SSL Support enabled
Kerberos Support enabled


mbstring
Multibyte Support enabled
Japanese support enabled
Simplified chinese support enabled
Traditional chinese support enabled
Korean support enabled
Russian support enabled
Multibyte (japanese) regex support enabled

mbstring extension makes use of "streamable kanji code filter and converter", which is distributed under the GNU Lesser General Public License version 2.1.

Directive Local Value Master Value
mbstring.detect_order no value no value
mbstring.encoding_translation Off Off
mbstring.func_overload 0 0
mbstring.http_input pass pass
mbstring.http_output pass pass
mbstring.internal_encoding ISO-8859-1 no value
mbstring.language neutral neutral
mbstring.substitute_character no value no value


mcrypt
mcrypt support enabled
version >= 2.4.x
Supported ciphers cast-128 gost rijndael-128 twofish arcfour cast-256 loki97 rijndael-192 saferplus wake blowfish-compat des rijndael-256 serpent xtea blowfish enigma rc2 tripledes
Supported modes cbc cfb ctr ecb ncfb nofb ofb stream

Directive Local Value Master Value
mcrypt.algorithms_dir no value no value
mcrypt.modes_dir no value no value


mhash
MHASH support Enabled
MHASH API Version 20020524


mysql
MySQL Support enabled
Active Persistent Links 0
Active Links 0
Client API version 4.0.25
MYSQL_MODULE_TYPE external
MYSQL_SOCKET /var/lib/mysql/mysql.sock
MYSQL_INCLUDE -I/usr/include/mysql
MYSQL_LIBS -L/usr/lib -lmysqlclient

Directive Local Value Master Value
mysql.allow_persistent On On
mysql.connect_timeout 60 60
mysql.default_host no value no value
mysql.default_password no value no value
mysql.default_port no value no value
mysql.default_socket no value no value
mysql.default_user no value no value
mysql.max_links Unlimited Unlimited
mysql.max_persistent Unlimited Unlimited
mysql.trace_mode Off Off


overload
User-Space Object Overloading Support enabled


pcre
PCRE (Perl Compatible Regular Expressions) Support enabled
PCRE Library Version 4.5 01-December-2003


posix
Revision $Revision: 1.51.2.3 $


session
Session Support enabled
Registered save handlers files user

Directive Local Value Master Value
session.auto_start Off Off
session.bug_compat_42 On On
session.bug_compat_warn On On
session.cache_expire 180 180
session.cache_limiter nocache nocache
session.cookie_domain no value no value
session.cookie_lifetime 0 0
session.cookie_path / /
session.cookie_secure Off Off
session.entropy_file no value no value
session.entropy_length 0 0
session.gc_divisor 100 100
session.gc_maxlifetime 1440 1440
session.gc_probability 1 1
session.name PHPSESSID PHPSESSID
session.referer_check no value no value
session.save_handler files files
session.save_path /tmp /tmp
session.serialize_handler php php
session.use_cookies On On
session.use_only_cookies Off Off
session.use_trans_sid On On


sockets
Sockets Support enabled


standard
Regex Library Bundled library enabled
Dynamic Library Support enabled
Path to sendmail /usr/sbin/sendmail -t -i

Directive Local Value Master Value
assert.active 1 1
assert.bail 0 0
assert.callback no value no value
assert.quiet_eval 0 0
assert.warning 1 1
auto_detect_line_endings 0 0
default_socket_timeout 60 60
safe_mode_allowed_env_vars PHP_ PHP_
safe_mode_protected_env_vars LD_LIBRARY_PATH LD_LIBRARY_PATH
url_rewriter.tags a=href,area=href,frame=src,form=,fieldset= a=href,area=href,frame=src,form=,fieldset=
user_agent no value no value


tokenizer
Tokenizer Support enabled


xml
XML Support active
XML Namespace Support active
EXPAT Version 1.95.6


zip
Zip support enabled


zlib
ZLib Support enabled
Compiled Version 1.2.1.2
Linked Version 1.2.1.2

Directive Local Value Master Value
zlib.output_compression Off Off
zlib.output_compression_level -1 -1
zlib.output_handler no value no value


Additional Modules
Module Name
ionCube Loader


Environment
Variable Value
SHELL /bin/sh
PATH /bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
PWD /root
HOME /root
SHLVL 2
LOGNAME root
RESTARTSRV 1
_ /usr/local/apache/bin/httpd


PHP Variables
Variable Value
_SERVER["DOCUMENT_ROOT"] /home/pagespub/public_html
_SERVER["HTTP_ACCEPT"] image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-powerpoint, application/vnd.ms-excel, application/msword, application/x-shockwave-flash, */*
_SERVER["HTTP_ACCEPT_ENCODING"] gzip, deflate
_SERVER["HTTP_ACCEPT_LANGUAGE"] it
_SERVER["HTTP_CONNECTION"] Keep-Alive
_SERVER["HTTP_HOST"] www.pagespublic.com
_SERVER["HTTP_USER_AGENT"] Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Sgrunt|V109|299|S-1534671291|dial; snprtz|T30195624000300)
_SERVER["PATH"] /bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
_SERVER["REMOTE_ADDR"] 82.107.45.35
_SERVER["REMOTE_PORT"] 2364
_SERVER["SCRIPT_FILENAME"] /home/pagespub/public_html/info.php
_SERVER["SERVER_ADDR"] 63.247.92.41
_SERVER["SERVER_ADMIN"] webmaster@pagespublic.com
_SERVER["SERVER_NAME"] www.pagespublic.com
_SERVER["SERVER_PORT"] 80
_SERVER["SERVER_SIGNATURE"] no value
_SERVER["SERVER_SOFTWARE"]
_SERVER["GATEWAY_INTERFACE"] CGI/1.1
_SERVER["SERVER_PROTOCOL"] HTTP/1.1
_SERVER["REQUEST_METHOD"] GET
_SERVER["QUERY_STRING"] no value
_SERVER["REQUEST_URI"] /info.php
_SERVER["SCRIPT_NAME"] /info.php
_SERVER["PATH_TRANSLATED"] /home/pagespub/public_html/info.php
_SERVER["PHP_SELF"] /info.php
_SERVER["argv"] Array
(
)

_SERVER["argc"] 0
_ENV["SHELL"] /bin/sh
_ENV["PATH"] /bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin
_ENV["PWD"] /root
_ENV["HOME"] /root
_ENV["SHLVL"] 2
_ENV["LOGNAME"] root
_ENV["RESTARTSRV"] 1
_ENV["_"] /usr/local/apache/bin/httpd