Morning,
I am in the process of moving our plastic server to a new machine. All going well so far, users, configs good, databases still transferring (will take a while).
However, I've tripped at a basic hurdle. Clients on our network are unable to see the server and it appears to be linked to good ol' windows firewall - as on disabling windows firewall on the server the client is then able to see the server.
Info:
Server OS: Windows Server 2019 Standard v. 1809
Client OS: Windows 10 Pro, Windows 11 Pro
Port used: 8087
Old server has been disconnected from the network
Troubleshooting so far
Using Telnet in command line on client computer confirms the port is open on the server's IP
Firewall rule created opening TCP 8087 over Domain, Private, Public - inbound and outbound
Tried reverting to the default port 8084
Any help much appreciated
Related
Okay, I feel I'm pretty good at problem solving but I'm stumped! I can't get connectivity to the SQL Server via the Hybrid Connector or directly.
System Overview:
1x Linux PHP Based WebApp with all the correct SQLSRV libraries working (using a azure sql server I can get the webapp working fine, but need to use our onsite server for the time being)
1x Onsite SQL Server (win2012, sql version 11.0.7), which has an external static IP (and FQDN) and exposed to the internet on port 1433 (I can use SMSS from an external IP to connect and manage the server - with that IP added to the firewall that is..)
So firstly - trying to connect via PHP / SQLSRV directly to the server doesn't work (even if I allow all internet traffic to connect to the server via the firewall) - which is odd as SMSS works. The server is Win2012 and TLS 1.2 is enabled - but I get Error code 0x2746. Investigating this, I think its something to do with openssl 1.1.1 and SQL Server still only using SHA1 - I modified the openssl.cnf file to SECLEVEL=1 - still not dice.
So I've proceeded to setup the Hybrid connections using port 1433 using internal machine name say 'SERVER01' for the endpoint - everything says connected on both the azure hybrid screen and also on the connection manager on the server. I can telnet from SERVER01 to the service endpoint bus and from SSH on the WebApp I can ping the hybrid end point 'SERVER01:443'
But trying to connect to the database from PHP using SQLSRV it timeouts.
Anyone got any pointers? I'm thinking its due to the old onsite server being too old (Win2012) and the SSL SHA1 issues.
I am currently working my way into gRPC. So far, I've created a gRPC server which runs on my machine as a service and listens on localhost. This works fine, when starting the client I get the expected results. Both client and server are targeting .Net framework 4.5.1.
However, I want to run the server as a service on a Windows Server 2016 and access it via a client from machines in the same domain.
All tutorials and examples I've found only show how to do it on localhost, which doesn't work when connecting to another machine. Can someone point me in the right direction of a guide or explain to me what to do to make the connection?
I currently have a Firebird 2.5 database at a client premises, installed on a Windows 7 Pro machine (32 bit), that has multiple stations in their local network that can connect to the database, along with the local machine being able to connect with our application and IBExpert.
However, for some of our software packages, a remote connection is required (outside of the local network). This previously was working but no longer works.
When I connect with FlameRobin from my office (I'm located in a different city / different network), I receive the following error message:
IBPP::SQLException
Context: Database::Connect
Message: isc_attach_database failed
SQL Message: -923
Connection not established
Engine Code : 335544421
Engine Message :
connection rejected by remote interface.
Performing this connection attempt with IBExpert, both from my office and from other external networks fail with a same message.
However, I am getting TCP/IP communication from what I can see. Here are the details of my troubleshooting steps for the last week:
Originally, I was receiving the following error when connecting from outside the network:
"Connection not established
Connection refused by remote interface"
Since that time, we have done a restart of the router and now have the current "connection rejected by remote interface." error message.
I can telnet to the public IP through port 3050 from my office and other outside networks.
I tested port 3050 on sites like YouGetSignal.com or CanYouSeeMe.org and they appear as open.
Other ports that we communicate on publicly are open and communicating.
The site has Kaspersky antivirus installed but all tests to connect via IBExpert while Kaspersky was in sleep mode behaved the same.
Installation of Firebird 2.5 to another workstation in the same local network, pointing to port 3051 (both in Firebird.conf and in the Windows Firewall and Router) show up as being open through Telnet and CanYouSeeMe.org but again, cannot be communicated on from outside via port 3051.
IBExpert works from a workstation in the network to the server
The server currently has no entry for RemoteBindAddress in the Firebird.conf
Wireshark shows that when a connecting from outside, there are packets coming through.
The TCP/IP test in IBexpert under Communication Diagnostics for the public IP as the host and the Service show the following Test Results:
Attempt connecting to XX.YY.ZZ.AAA.
Socket for connection obtained.
Found service 'GDS_DB' at port '3050'
Connection established to host 'XX.YY.ZZ.AAA',
on port 3050.
TCP/IP Communication Test Passed!
Database path, username, and password have all been checked multiple times.
locally on the server, I've changed security of the database.FDB and the security2.FDB to have Everyone, Full Control
At this point, we have a scheduled restart of the ISP's modem happening soon, although the fact that we have full TCP/IP communication over the port makes me doubtful that this is the issue.
If anyone can lead me down any recommended next steps to debug or to any tools that are available to help in this situation, that would be greatly appreciated.
This turns out to be a networking issue. We performed the following tests:
We performed a power cycle on the ISP's modem which showed no change in behavior
We connected a laptop directly to the ISP's modem but couldn't communicate to FB even with proper port forwarding rules in place on the machine and firewall.
We ran wireshark on both sides and on connection attempts, we found many attempts to connect with retransmissions that failed.
The technical team at the client side decided to install a VPN capable router and now we're good to go. From what we found there may be some kind of ISP blocking occurring as many of the tech teams remote services were failing to connect with similar behavior.
Hopefully this post helps people in the future with remote connectivity debugging, and all of the places you can look at when you're running into this problem.
I have a Windows 7 PC with Forefront TMG proxy. There is a VirtualBox virtual machine installed with Ubuntu 16.04 (64-bit) guest OS. I'm not a seasoned Unix-user, so I tried to configure Ubuntu's network through GUI window.
After several tries I wound up with these settings:
https://i.stack.imgur.com/in4yR.jpg
All works fine now. I can use browser and git and do various network stuff. But!
I have a Rails application, which uses a remote PostgreSQL database. When I start my Rails server, it throws this exception:
Puma caught this error: could not connect to server: Network is unreachable
Is the server running on host "this_is_the_host_url" and accepting
TCP/IP connections on port 5432?
(PG:ConnectionBad)
This applications works fine on the other PC with similar Windows 7 and VB Ubuntu, but without a proxy. Also I tried to reach the remote DB-server from my host Win7 with PGAdmin - all works fine, even with proxy. The issue is somewhere between my Ubuntu guest OS and my Windows host OS.
Should I configure proxy settings in Ubuntu in a different way?
Any other way to resolve this issue?
Traceroute shows this:
1 10.0.2.2 (10.0.2.2) 0.638 ms 0.577 ms 0.549 ms
2 10.0.2.2 (10.0.2.2) 29.369 ms !N 53.000 ms !N 75.644 !N
As I can get it, 10.0.2.2 is my host OS ip.
I searched through the web, but all I could get belongs to the opposite side: to reach to the proxied VB Ubuntu, not from it.
I have some problem with my WAMP server and I downloaded from the official website. I wanted to use only for the local server (for Chrome), without WordPress, only for HTML/CSS/JS files. The servers (Apache, PHP and MySql) and the localhost webpage has оpen, but when I try to open my projects it's giving me the error:
This webpage is not available ERR_NAME_NOT_RESOLVED: and in details:
The server at problem%201 can't be found, because the DNS lookup
failed. DNS is the network service that translates a website's name to
its Internet address. This error is most often caused by having no
connection to the Internet or a misconfigured network. It can also be
caused by an unresponsive DNS server or a firewall preventing Google
Chrome from accessing the network.
P.S. OS: Windows 8.1 Pro N