Not able to run web service on linux on specific ports

Question

I have created linux VM on azure portal. It 's version is Centos 8.0 and I am tryign runnign docker on top of that. I ahve cretaed web apllication using Julia Genie prog language. When I deployed web servcie its not allowing access to ports. I ahve already created inbound and outbound rules for port under azure NSG and added same in port in linux firewall. But still its not working. It's throwing below error . I already validated port has no issue and no application running on the port.

Info:
└ Web Server starting at http://<my-ip>:8010 - press Ctrl/Cmd+C to stop the server.
ERROR: LoadError: cannot bind to port; may already be in use or access denied
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:33
 [2] #listen#10
   @ /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/Sockets/src/Sockets.jl:624 [inlined]
 [3] HTTP.Servers.Listener(addr::Sockets.InetAddr{Sockets.IPv4}, host::String, port::String; sslconfig::Nothing, reuseaddr::Bool, backlog::Int64, server::Nothing, listenany::Bool, kw::Base.Iterators.Pairs{Symbol, Union{Nothing, Bool}, Tuple{Symbol, Symbol}, NamedTuple{(:verbose, :rate_limit), Tuple{Bool, Nothing}}})
   @ HTTP.Servers ~/.julia/packages/HTTP/uAaAw/src/Servers.jl:69
 [4] #Listener#3
   @ ~/.julia/packages/HTTP/uAaAw/src/Servers.jl:74 [inlined]
 [5] #listen#6
   @ ~/.julia/packages/HTTP/uAaAw/src/Servers.jl:312 [inlined]
 [6] (::Genie.Server.var"#6#13"{Bool, Nothing, Nothing, Bool, Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}}})()
   @ Genie.Server ~/.julia/packages/Genie/XpFvB/src/Server.jl:113
 [7] up(port::Int64, host::String; ws_port::Nothing, async::Bool, verbose::Bool, ratelimit::Nothing, server::Nothing, wsserver::Nothing, open_browser::Bool, reuseaddr::Bool, updateconfig::Bool, http_kwargs::Base.Iterators.Pairs{Union{}, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ Genie.Server ~/.julia/packages/Genie/XpFvB/src/Server.jl:137
 [8] #up#17
   @ ~/.julia/packages/Genie/XpFvB/src/Server.jl:157 [inlined]
 [9] top-level scope
   @ /app/routes.jl:5

Answer 1

Have you tried to see if firewall in CentOS is blocking the ports?

Check the running status of firewall: sudo firewall –cmd --state

Temporarily stop the firewall: sudo systemctl stop firewalld

Check again and see the port access is working after stopping the firewall. If the issue due to the firewall, you may need to disable or filter the required ports in firewall

---

--please don't forget to upvote and Accept as answer if the reply is helpful--