problems sharing same subnet using TCP and UDP in OpenVPN

[NewtownGuy]

I keep having problems with some remote client machines trying to connect to my OpenVPN server using UDP. I've set up a second instance of OpenVPN on my server to receive TCP. The problem is that I can't figure out how to have both instances assign clients to share the same network subnet so that a client machine will get the same VPN IP address regardless of whether it connects with UDP or TCP. I use ccd to assign particular VPN IP addresses to clients.

Please note that the basic setup works ok with either TCP or UDP so long as different subnets are used. I just can't share the same subnet, which is why I'm asking for help.

Here's a ccd for a client:

ifconfig-push 10.254.0.81 10.254.0.82

Here's a part of the config file for the OpenVPN server that uses UDP (it creates tun254):

proto tcp-server

mode server
tls-server
ifconfig 10.254.0.1 10.254.0.2
ifconfig-pool 10.254.1.5 10.254.3.251
route 10.254.0.0 255.255.252.0
push "route 10.254.0.0 255.255.252.0"

Here's a part of the config file for the OpenVPN server that uses TCP (it creates tun255):

proto tcp-server

mode server
tls-server
ifconfig 10.254.2.1 10.254.2.2
push "route 10.254.0.0 255.255.252.0"

Note that I use the UDP server to setup the local routing in the 10.254.0.0/22 subnet and to assign the IP-address pool since I want them common to both instances.

Here are the resulting routes on the server:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.254.2.2 * 255.255.255.255 UH 0 0 0 tun255
10.254.0.2 * 255.255.255.255 UH 0 0 0 tun254
192.168.192.0 * 255.255.255.0 U 0 0 0 eth0
10.254.0.0 10.254.0.2 255.255.252.0 UG 0 0 0 tun254
default 192.168.192.1 0.0.0.0 UG 100 0 0 eth0

Here are the resulting routes on a client:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.254.0.82 * 255.255.255.255 UH 0 0 0 tun254
192.168.192.0 * 255.255.255.0 U 0 0 0 eth0
10.254.0.0 10.254.0.82 255.255.252.0 UG 0 0 0 tun254
default 192.168.192.1 0.0.0.0 UG 100 0 0 eth0

Clients that use UDP are able to ping ok. Clients that use TCP cannot. What am I doing wrong ?

Thank you in advance for your help.

-- NewtownGuy