Hi all,
I recently had to demonstrate one of my apps at a conference at
another university. The app accesses my MySQL server at home, but over
a non-standard port (i.e., not 3306). The conference hosts provided a
temporary login to get onto the institution's WiFi network. During my
demo I was baffled to discover that some people could use my app just
fine, while others on the same network encountered a long hang while
the app attempted to access my MySQL server, culminating in a failure
and error message about an invalid MySQL connection id.
Eventually, I discovered that there were two different accounts that
we could use to access the network. The first, the temporary account,
gave conference participants relatively unrestricted access, but the
other, a 'guest' account, gave much more limited access. Relevant to
this issue, the guest access apparently had a more restrictive
firewall that blocked the port I needed.
So this brings up a question. How could I check any given network to
make sure that the appropriate ports is open BEFORE committing to
attempting a MySQL connection, which seems to take about 2 minutes
before it times out. I'm working on OS X, but would need a cross
platform solution. Would some kind of netstat shell call give me the
information I need?
Regards,
Devin
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