TCP/IP connection issue from VLAN 26 to VLAN 29

[montemayorru]

We are encountering an issue regarding to our TCPIP stack whenever we are changing the IP address from 172.**.***.126 to 172.**.***.146 and from VLAN 29 to VLAN 26.
GIVEN:
1. OSA EXPRESS CARD
DEV=(051,052), DATAPATH=053
TCPIP version: 15G
OS: zVSE 5.2

2. 172.**.***.126
Subnet used for .126 = 255.255.255.128
Gateway used for .126= 172.**.***.1
VLAN 29

3. 172.**.***.146
Subnet used for .146 = 255.255.255.128
Gateway used for .146= 172.**.***.129
VLAN 26


For .126, TCPIP connection is working fine without any issue.

But for .146, whenever we ping it or creating a TN3270 session, Mainframe console just detecting the pinging with no connection received at the other end as shown below;

FROM PC (Command Prompt)
Pinging 172.**.***.146 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 172.**.***.146:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

MF Console response:
Z2 0466 0010: IPC108I ICMP Echo request has been received from: >
Z2 0466 172.**.*.*40
Z2 0466 0010: IPC108I ICMP Echo request has been received from: >
Z2 0466 172.**.*.*40
Z2 0466 0010: IPC108I ICMP Echo request has been received from: >
Z2 0466 172.**.*.*40

CREATING TN3270 connection (connection failed) using ATTACHMATE.
Z2 0466 001B: TEL917I Daemon Resetting Telnet Termname: TELNXXS1 >
Z2 0466 IPaddr: 0.0.0.0
Z2 0466 001C: TEL917I Daemon Resetting Telnet Termname: TELNXXS2 >
Z2 0466 IPaddr: 0.0.0.0
Z2 0466 001D: TEL917I Daemon Resetting Telnet Termname: TELNXXS3 >
Z2 0466 IPaddr: 0.0.0.0

Any advise that we can do and we can check to resolve the issue.