302t visible on network but connection fails.

[Specksturm]

Hi,
First I want to start with I am using a Mac running OS High Sierra. (10.13.3)
And have been using without problems earlier. The 302t is still working fine over wan and with apps. On the local network it shows up as available AFP in the Finder window but when I try to acess it (click on it) it says "connection failed". Then i try "connect as" and it says "there was a problem connecting to the server" It does not even show me the log in box where I fill in username and password. Same thing when I try to use the Time machine backup disk on the server. I have deleted the login from the computers keychain so I stand clueless. I know the username and password I have never changed it but the mac does not give me a form to fill.

We have another computer that can communicate with the server. That computer uses another login / Username and password.

I am running out of ideas here so any help / ideas would be appreciated.

[orion]

I think you can check two things:

• ADM defender might block your Mac. You can check the black list: ADM web -> Settings -> ADM defender.
• Check the log if there are any clues: ADM web -> System information -> Log.

[Specksturm]

Thank you Orion, this was the solution.
My computer's local IP was black listed and i removed it from the list. Now everything works as it should.