"Its not an issue with the network"

Hey guys,

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I work for a storage vendor and its a daily conversation that I have with people that we have an issue that requires them to engage their network team. This normally turns badly as they "have already engaged the network team and they said there is no issue." or something along that line. I tend to give a specific statement to give to their network team such as "arp broadcasts are not making it from this device to this device, can we check the vlans". "its not the network" is a meme of sorts with my group of coworkers. It normally comes down to me telling the storage admin that "we can not move forward without engaging the network team, I would be willing to show them X Y and Z." Once I do this they will generally do as I ask, and then its a 45second conversation with the appropriate network guy explaining that someone messed up the vlan on a port. Fixed in 15 seconds.

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My question:

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Why does every storage admin hate engaging their network team? What can we do to make it a more pleasant experience? What do you guys think about storage admins? Can we improve this relationship?