I have a question that maybe one of you can answer or have seen before. We recently deployed in our work environment a Ubuntu server. The server works fine, does it's needed purpose and then some. However, there seems to be a minor problem with the network on this machine. We have many VLANs in our organization, but I will just refer to this as the UBUNTU VLAN. We have a management VLAN that has access to all VLANs in our Datacenter including the VLAN the UBUNTU server resides.
The UBUNTU server can access everything locally on its same local VLAN, however if I try to access anything on our management VLAN it fails. If I initiate the connection from a host on the management VLAN to the UBUNTU server it also fails. However, if I simply ping the UBUNTU server from a host on the management network, all of a sudden connections begin working. The Ubuntu server then begins to accept connections on its ports (80,443,22, etc.) Example if I try to open up an SSH connection to the UBUNTU server from a host on the management network this doesn't work, but if I ping the UBUNTU server from the same host on the management network the UBUNTU server replies, and then I can connection on port 22. This is very strange.
Also as an FYI, there are other servers on the Ubuntu server (Windows servers), and they have no problem with communication to the management VLAN. The UBUNTU server is the only host that has this issue. Every morning when I come in, I have to initiate a ping to the UBUNTU server, in order for the services to work across the management network. Is there a way I can avoid this hassle everyday, and the network for this UBUNTU server can be 100% fully functional. Thank you so much in advance for any help or advice you guys can provide.