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
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.
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
I am trying to setup up guacamole in a Digital Ocean Droplet (Ubuntu 18.04). I followed the steps provided in https://computingforgeeks.com/install-and-use-guacamole-on-ubuntu/ to setup guacamole and used Postgresql to authenticate guacamole by following the instructions provided in https://guacamole.apache.org/doc/gug/jdbc-auth.html#idm46227496294336.
The installation got over and I am able to access the webpage at http://droplet-ip:8080/guacamole, but when I try to connect to a remote machine over RDP I get a connection error stating 'The remote desktop server is currently unavailable. If the problem persists, please notify your system administrator, or check your system logs.'
I have checked the login credentials of the remote device, it's hostip and RDP port number, everything is correct. I am able to login to the machine through Remote Desktop Connection in Windows. I can also login to the same remote machine with same credentials in a perfectly working guacamole setup in another digitalocean droplet.
I have also tried this by installing guacamole using docker by following instructions provided in https://wiki.networksecuritytoolkit.org/index.php/HowTo_Setup_Guacamole, but still face the same problem. What am I doing wrong? I would be happy if someone could help me solve this problem
I was finally able to figure out why I was not able to connect to a remote device in Guacamole.
My Digital Ocean Linux droplets had freeRDP already installed. But Guacamole Server 1.3.0 works on freeRDP2. I had to make Guacamole send requests through freeRDP2.
I have enabled SFTP in the connection settings. But somehow the OpenSSH was corrupted in the remote machine resulting in connection error. So, I disabled SFTP. I think guacamole tries to establish RDP and SFTP connection in the very beginning, so even if one of the protocols fail, connection cannot be established. I am not proficient with guacamole so not sure with this point.
After resolving these problems, guacamole was able to send connection request to the remote machine. I checked the status using netstat and the status was SYN_SENT, but there was no response from the remote server. The problem was Firewall.
I allowed the ports for RDP in windows firewall, but the remote machine was in a network which had external firewall. I added the Guacamole Server IP in allowed list for NAT forwarding in the firewall device and finally I was able to establish a connection with the remote machine.
I need to connect to a work remote server via work VPN (the server is web GUI so connection is via https) which requires hosts resolution, meaning I have to configure the host name and map to the IP address in the hosts file. This is how I connect to the remote server on my Mac.
I just got a new iPad 2020 and I will like to connect to the server on my iPad.
For me to access the hosts file on iPad, I will have to jailbreak of which I don’t wanna do that. I’ve read counts of articles online on how to go about using some other apps, but it only works for if your server and your device are both on thesame network and VPN is not used.
Appreciate if there is a workaround for me to do this:
I need to connect via work VPN;
Access the server using the host name on safari etc.
Thanks.
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.