How can I clear the DNS cache?

I haven't been able to connect to my local Library since January. When I key in the URL, it starts the access routine and then after about 20 minutes, I have to kill it because nothing happens. I contacted the IT folks at the library and was told that they had made a few changes around the time my problem began so maybe the DNS cache was still pointing at the old info. He recommended that I enter TERMINAL mode and try to clear the DNS cache, using "sudo dscacheutil -flushcache" command. . I attempted this several times, even changing my applid password, and kept getting invalid responses.

I did try that and after a few trys it finally worked. It took quite awhile for the window for the library to finally come up, but it did and I am now able to get in and out with no problems with my library access. Now when I call up my bank, parts of it don't come up and it kicks me out. Now, I'll have to search for what fixes that - as it has happened before, so I know it's fixable. Thanks for you help though.

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