Unable to telnet and tftp to controller

hello experts!!!
5508 controller is at the headquarters which can be normally pinged, telnetted, http'd and tftp'ed....
at the remote site, controller can be pinged and http'ed but cannot be telnetted and tftp'ed.
there is a complete tracert from the remote site pc all the way to the controller.
from a switch at a remote site, the controller can be telnetted.
but from a pc on the remote site (which belongs to a remote site vlan), it is unable to telnet and tftp the controller.
all active components can be telnetted from the remote site, such as the core switches and routers at the headquearters, except the controller.
upgraded the controller code to 7.2.xxx in headquarters but still unable to telnet and tftp the controller from remote site.
is there any more settings on the controller for telnet and tftp?
what could be the problem why the controller is not available for telnet and tftp from the remote site?
thank you, experts, in advance for your replies!!!

Hello, Leo!
See output of the command:
(Cisco Controller) >show network summary
RF-Network Name............................. GID2012
Web Mode.................................... Enable
Secure Web Mode............................. Enable
Secure Web Mode Cipher-Option High.......... Disable
Secure Web Mode Cipher-Option SSLv2......... Enable
OCSP........................................ Disabled
OCSP responder URL..........................
Secure Shell (ssh).......................... Enable
Telnet...................................... Enable
Ethernet Multicast Forwarding............... Disable
Ethernet Broadcast Forwarding............... Disable
AP Multicast/Broadcast Mode................. Unicast
IGMP snooping............................... Disabled
IGMP timeout................................ 60 seconds
IGMP Query Interval......................... 20 seconds
MLD snooping................................ Disabled
MLD timeout................................. 60 seconds
MLD query interval.......................... 20 seconds
User Idle Timeout........................... 28800 seconds
ARP Idle Timeout............................ 300 seconds
Cisco AP Default Master..................... Enabled
--More-- or (q)uit
AP Join Priority............................ Disable
Mgmt Via Wireless Interface................. Enable
Mgmt Via Dynamic Interface.................. Enable
Bridge MAC filter Config.................... Enable
Bridge Security Mode........................ EAP
Mesh Full Sector DFS........................ Enable
AP Fallback ................................ Enable
Web Auth Redirect Ports .................... 80
Web Auth Proxy Redirect ................... Disable
Web Auth Captive-Bypass .................. Disable
Web Auth Secure Web ....................... Enable
Fast SSID Change ........................... Disabled
AP Discovery - NAT IP Only ................. Enabled
IP/MAC Addr Binding Check .................. Enabled
CCX-lite status ............................ Disable
oeap-600 dual-rlan-ports ................... Disable
oeap-600 local-network ..................... Enable

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