Server can't ping anything, but other devices can ping it

[Exoticbutter]

I seem to have a problem with pinging. My IoT devices can ping the server, but the server can't ping anything, not even the router. I'm a beginner with a month's of study in networking only. Please tell me in detail why the server can't ping other devices. Any help will be much appreciated!

Due to limited image size, I have attached only limited images. Please help me figure it out!!

[Exoticbutter]

@paul driver Hi, I have already disabled all firewalls, but it still doesn't go through. 

[Exoticbutter]

@balaji.bandi I tried to ping end devices with server, but none of it works, it only works the other way, round devices -> server

[paul driver]

Hello
No sure i understand you topology however you have a server 10.0.0.1 with no defailt gateway and a router with an ip address 10.0.0.10 with a default-gaeway of the server?

The router should be the one servicing the routing, as such try the following:
server
10.0.0.10
255.0.0.0
10.0.0.1

rtr
10.0.0.1
255.0.0.0

[Exoticbutter]

Thanks for the reply.

My server still doesn't ping. Regarding the topology, it's quite hard to explain. If it wouldn't be too much trouble, I'll send you the lab PDF.

[Exoticbutter]

Here is my pkt file for your reference. I tried everything