Error. Maximum of 100 connections available

Hello all!
Some time after the start pptpd fails, users can not connect to the 
server. In the log the following entries:

pppd[10633]: Script /etc/ppp/ip-down finished (pid 12658), status = 0x0
pppd[10633]: Exit.
pptpd[10632]: CTRL: Client 10.0.10.21 control connection finished
pptpd[24822]: MGR: No free connection slots or IPs - no more clients can 
connect!
pptpd[15774]: CTRL: getpeername() failed
pptpd[15774]: getpeername: Transport endpoint is not connected
pptpd[15774]: CTRL: Asked to free call when no call open, not handled well
pptpd[15774]: CTRL: Could not free Call ID [admin shutdown]!
pptpd[15774]: CTRL: Couldn't write packet to client.
pptpd[15774]: CTRL: Couldn't write packet to client.
pptpd[15774]: CTRL: Failed to set client socket non-blocking
pptpd[15774]: fcntl: Bad file descriptor
pptpd[15774]: CTRL: Asked to free call when no call open, not handled well
pptpd[15774]: CTRL: Could not free Call ID [admin shutdown]!
pptpd[15774]: CTRL: Couldn't write packet to client.
pptpd[15774]: CTRL: Couldn't write packet to client.
pptpd[15774]: CTRL: Client 10.0.61.1 control connection started
kernel: [1251099.796441] PPP MPPE Compression module registered
pptpd[15962]: MGR: connections limit (100) reached, extra IP addresses 
ignored
pptpd[15963]: MGR: Manager process started
pptpd[15963]: MGR: Maximum of 100 connections available

My configuration files.

*/etc/pptpd.conf*
ppp /usr/sbin/pppd
speed 115200
option /etc/ppp/options.pptp
connection 500
localip 192.168.1.1
remoteip 192.168.1.10-250
pidfile /var/run/pptpd.pid

*/etc/ppp/options.pptp*
lock
noauth
nobsdcomp
nodeflate
idle 0
require-mppe
mtu 1492
mru 1492
lcp-echo-failure 30
lcp-echo-interval 5
ipcp-accept-local
ipcp-accept-remote
plugin radius.so
ms-dns 192.168.1.1
asyncmap 0
auth
refuse-pap
+chap
refuse-mschap
+mschap-v2
defaultroute
noccp
noaccomp
nopcomp

Why is a maximum of 100 connections, if the configuration file is 500?
After the restart pptpd everything works fine.

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