Unable to add Cisco ASA to Dashboard

I'm currently using ManageEngine Netflow Analyzer ver. 8 and so far its has been good. My issue is that, I have 2 Cisco ASA5510 running on version 8.2(2). One firewall sits at the Data Center which is another location and one sits here in the office.

I'm able to add the office ASA to the dashboard based on the recommended configuration since its just internal network. But I'm unable to add the ASA from the Data Center which is another location considering I have added the recommended configuration wherein the only difference is that I have pointed to the public ip address of our firewall on the outside interface. I have already permitted "udp any any" on both firewalls both for incoming and outgoing interface yet still no luck. We have site to site VPN from my office to data center wherein I have configured netflow to sent packets via vpn using the internal ip address of the server in our office, yet still no luck.

See below configuration of my ASA.

===========

OFFICE ASA

===========

interface Ethernet0/0

nameif outside

security-level 0

ip address 203.XX.XX.65 255.255.255.240

interface Ethernet0/1

nameif inside

security-level 100

ip address 174.17.2.1 255.255.255.0

access-list acl_in extended permit icmp any any

access-list acl_in extended permit tcp any any

access-list acl_in extended permit udp any any

access-list acl_out extended permit udp any any

access-list netflow-export extended permit ip any any

access-group acl_out in interface outside

access-group acl_in in interface inside

flow-export destination inside 174.17.2.99 9996

flow-export template timeout-rate 1

flow-export delay flow-create 60

class-map netflow-export-class

match access-list netflow-export

class-map inspection_default

match default-inspection-traffic

policy-map type inspect dns preset_dns_map

parameters

message-length maximum 512

policy-map ntop-netflow-export-policy

class netflow-export-class

flow-export event-type all destination 174.17.2.114

policy-map global_policy

class inspection_default

inspect dns preset_dns_map

inspect ftp

inspect h323 h225

inspect h323 ras

inspect netbios

inspect rsh

inspect rtsp

inspect skinny

inspect esmtp

inspect sqlnet

inspect sunrpc

inspect tftp

inspect sip

inspect xdmcp

inspect ip-options

policy-map netflow-export-policy

class netflow-export-class

flow-export event-type all destination 174.17.2.99

service-policy netflow-export-policy global

=====================

DATA CENTER - ASA

=====================

interface Ethernet0/0

speed 10

nameif outside

security-level 0

ip address 203.XX.XX.50 255.255.255.240 standby 203.XX.XX.59

access-list INET_OUTBOUND extended permit udp any any

access-list INET_INBOUND extended permit udp any any

access-list netflow-export extended permit ip any any

access-group INET_INBOUND in interface outside

flow-export destination outside 174.17.2.99 9996

flow-export destination outside 203.116.29.65 9996

flow-export template timeout-rate 1

flow-export delay flow-create 60

class-map global-class

match any