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Port change to 80 gives socket.error: [Errno 13] Permission denied

Hi Expert,
I have deployed ERPNext on digitalocean. I am able to access it with domain:8000 but i wish to run it on port 80 for that i tried # bench --site site1.local serve --port 80 but it gives error. Following is full stack trace
Traceback (most recent call last):
File “/usr/lib/python2.7/runpy.py”, line 174, in _run_module_as_main
main”, fname, loader, pkg_name)
File “/usr/lib/python2.7/runpy.py”, line 72, in _run_code
exec code in run_globals
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 94, in
main()
File “/home/frappe/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 18, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 722, in call
return self.main(*args, **kwargs)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 697, in main
rv = self.invoke(ctx)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/core.py”, line 535, in invoke
return callback(*args, **kwargs)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/click/decorators.py”, line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/init.py”, line 24, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/frappe/frappe-bench/apps/frappe/frappe/commands/utils.py”, line 380, in serve
frappe.app.serve(port=port, profile=profile, site=site, sites_path=’.’)
File “/home/frappe/frappe-bench/apps/frappe/frappe/app.py”, line 238, in serve
threaded=True)
File “/home/frappe/frappe-bench/env/local/lib/python2.7/site-packages/werkzeug/serving.py”, line 720, in run_simple
s.bind((hostname, port))
File “/usr/lib/python2.7/socket.py”, line 228, in meth
return getattr(self._sock,name)(*args)
socket.error: [Errno 13] Permission denied

This might help https://stackoverflow.com/questions/38298652/permissionerror-errno-13-permission-denied-flask-run

[solution]Some how i was not able to run on port 80 for development mode but when i reinstalled using production mode, port 80 is available and it runs

Not sure but I think running the following command fixed this for me

sudo bench setup production <ubuntu-user>