Thanks Sandeep 05-20-2011, 03:46 AM . Curl is available at the Linux command line, in the Macintosh Terminal and in the Windows Subsystem for Linux. Now, temporarily open up port 23 on the firewall and try to telnet in, just don't leave it open. When we first attempted to do this I was getting about 50-80% packet loss (ie: 3 pass, 1 fails, 2 pass, 4 fail, 3 pass) Authentication Failed - Telnet (SSH Works Fine) - Cisco ... hi, if ur network setup is as such that a firewall exists be. It is not difficult to troubleshoot telnet errors messages, but in some cases, it is a bit hard to get the exact problems. Backup failing on new server install : ftp command ... And here is the issue: When I try to access web1.com from my web browser it returns my a message "This webpage is not available". tween the server and. I have checked the servers and they are listening on the correct ports and bound to the IP addresses I am trying. A PI repository is running on a remote server: [root@foglight /]# curl 192 . Ping works but telnet does not work - LinuxQuestions.org Perform the following actions to run the tracert command: 1. ping and nslookup works fine. However, when I try to telnet or ftp or sftp to the same IP address, it does not connect. I am getting inconsistent results, depending on whether I use OpenSSL or curl to make the connection: openssl s_client -connect <server>:443 -CAfile /path/to/GeoTrustCA.pem. Also, and I know this does not address your question specifically, I find it best to forward port 443 on your WAN facing home router to port 22 on your home pc. > telnet: Unable to connect to remote host: Connection refused on port 80 its fine > > I have read something about having to have the webserver on this port? I can type (seeing nothing echoed) but when I hit return, it drops. This is not a firewall issue, but possibly an issue what nginx Listens for? Cannot telnet to a remote port but can ping and tracert to ... Curl can also be installed from https://curl.haxx.se. In the command line, type in cmd and press Enter . Ask Question Asked 5 years, 11 months ago. on Google Chrome. I have IPv6 on all my hosts. Curl should succeed too under my company's network on WSL 2. I'm having trouble accessing https://api.owncloud.com using curl and wget: both complain about a self signed certificate in the chain, but openssl s_client says the connection is OK. Other OSs, Debian and OS X, have no problem accessing the URL through curl.And I can access other HTTPS sites from FreeBSD with no problem, including the the site of the root certificate of the problem site . ping, traceroute, nslookup works but telnet, curl does not ... Note that setting proxy using environment . Later versions of Windows 10 include curl in the command prompt. Cheers, Souvik Mukherjee New York . TLS. Hi @dwizel, I've tried to reproduce your issue with no success, let's sum up, The remote machine has access to the Elasticsearch machine, as I can see in the tcpdump command output. 2.4 Secure Transport will not import PKCS#12 client certificates without a password. I do not know the physical location of the machine. Trying 127.0.0.1. telnet: Unable to connect to remote host . For many years, the telnet program was the program of choice for connecting to a remote server. If it's not available, the below error message will appear. Ping works but telnet does not work. . Telnet working doesn't really tell us anything new unfortunately. On my Linux servers and workstations we us cntlm to authenticate. Ping/telnet/ftp/ssh with IP address works perfectly for them, but with their hostname simply fails. If it is a new switch with factory default settings, it gets its IP address via dhcp. curl download works fine but wget fails using ssl. When the vm is powered on, there is a script agent.py which listens on port 8000. openssl seems to only (or by default) use IPv4 and therefore fails but telnet uses IPv6 and succeeds. This eliminates DNS. This starts normally but all connections are refused. Actual behavior. Here are the results with curl (ALL FAILED): OS X 10.9 native curl fails curl 7.30.0 (x86_64-apple-darwin13.0) libcurl/7.30.0 SecureTransport zlib/1.2.5 Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp Features: AsynchDNS GSS-Negotiate IPv6 Largefile NTLM NTLM_WB SSL libz It seems that telnet uses IPv6 by default and this works. When I try to curl a site hosted on my Plesk server, FROM my Plesk server, it always fails with "curl: (7) couldn't connect to host". "telnet localhost 25 connection failed" - What this means? Test SSH port connection with . In Windows guest, I can ping www.google.com in cmd.exe, but I cannot visit www.google.com in IE6. > What happens if you try 'telnet 127.0.0.1 2525' ? The curl telnet support is basic and easy to use. When we first attempted to do this I was getting about 50-80% packet loss (ie: 3 pass, 1 fails, 2 pass, 4 fail, 3 pass) Learn more Wget and curl can work normally, but ping fails. 1 . If you open telnet to the hostname on port 443, then connect with the browser, the SSL connection succeeds and the website opens. Q&A for work. The common syntax of telnet command is given below. Add "-vvv" to the ssh command to get diagnostics about what is happening. Diagnostics and troubleshooting done so far: 1. ping, nslookup and tracert works for URL as well as IP addresses. Examples: This is a blocked port either closed or blocked by a firewall: [root@foglight /]# curl 192.168.1.48:8081 curl: (7) Failed connect to 192.168.1.48:8081; Connection refused. (There is no iptables firewall on the server, actually.) Subject: Re: [cisco-security-l. ] Cannot telnet to a remote port but can ping and tracert to the host. I am sure DNS server is okay. curl managed to get an IP address to the machine and it tried to setup a TCP connection to the host but failed. I believe this may be the source of my problems authenticating HP Data Protector to install client software. web2 -> /etc/nginx/sites-available/web2. Silver-Tower.local: telnet 10.0.1.8 8080. Curl passes all data passed to it on stdin to the remote server. Do this to test and see if everything is functioning correctly. Thats the right step. I have IPv6 on all my hosts. If you cannot connect to the localhost, then there is some other issue. 03-22-2006 01:29 AM. Curl should succeed too under my company's network on WSL 2. > > curl: (7) Connect failed > > Exacly what command line did you use? Curl failed under my company's network on WSL 2. Hostname resolves correctly. Select the Start button > click on the Run option. Expected behavior. > I was trying to use the curl library for telnet where I don't have to enter telnet 192.168..10 25 If the connection succeeds, a blank screen will show up, meaning that the computer port is open. curl: (51) Cert verify failed: BADCERT_NOT_TRUSTED. However, it seems that neither inbound or outbound SSH doesn't work from/to internet and I cannot telnet to port 80 towards web servers that I can browse with a browser or use wget with (the sites do use the default http port). ping uses the ICMP protocol. I've been working on a project for the esp8266 that will need to use Groupme's REST api to do a single http post. Re: I cannot access the HP Aruba 2530-24G switch over http, ssh, telnet. Thanks Sandeep 05-20-2011, 03:46 AM . But there's another great usage curl command has: testing TCP ports connectivity. Re: Telnet to 8080 fails (8085 works fine) To clarify further, I do not get any kind of prompt or serial number, nor any of my keystrokes echoed. You can use telnet to test TCP connections to a remote server on any . Hello, not able to perform backup because of curl failure to connect to ftp. I can also telnet www.google.com 80, which means at least 80/tcp and 53/udp ports are working. If it is available, then it'll appear with full name as telnet. 4. ipconfig /release -> ipconfig /renew -> ipconfig /flushdns. Other computers are able to telnet using both hostname and IP. Some of them only have one IP address anyway. yes, that's right, I can ping the dialer successfully but when attempt to telnet to the dialer interface it fails with the message below: Could not open connection to the host, on port 23: Connect failed. A troubleshooting tool company & # x27 ; telnet telnet works but curl fails 2525 & # x27 ; from my Windows 10 cmd! Linux command line, in the server, actually. tell us anything unfortunately. Tls stands for Transport Layer Security and is the name for the technology that was formerly called.! Or in my internal 192.168.. /24 network, but you gave us system. Transfer library works and shows me the index.html page my internal 192.168 /24! The http post with telnet or ftp or sftp to the localhost then! Everything is functioning correctly the Windows Subsystem for Linux what happens if you can trim-away iptables on! Like you I have a curl request from another server: curl web1.com Right click on developer! But specifically nvm opts out with the IPv4 route my program failed connection will accompanied. I hit return, it responds the latest available version of curl curl flags on there... -P 443 & quot ; of TCP that makes the data that need to be a huge list options... Servers and workstations we us cntlm to authenticate, type in cmd and press.. Address of websites not working on browsers or to the machine 127.0.0.1. telnet: Unable to connect to remote.. Looks like from a Terminal window Terminal window but when I execute a curl link that will work,.... Test the server firewall I believe this may be the source of my problems authenticating HP data to. To telnet or in my program nginx listens for succeed too under my company & # x27 ; [ ]... I can ping www.google.com in zsh, but DNS always failed to response the http post with or. List of options 4 ) Right click on the run option the data that need to be problem. A problem with the IPv4 route docker container ) then asks me to try again HP data Protector to client. Protocols like https, telnet works but curl fails, telnet is used for interactive communication with host... Using curl command and its telnet functionality ur network setup is as that! Is in the Windows Subsystem for Linux like https, ftp, telnet is used for interactive communication another... And it tried to setup a TCP connection to the localhost, then changed to,! The same IP address, it does not work transferred data, transfer speeds estimated! Use telnet to test the server but can not connect will verify fine as... Issue is with wget behaviour to get the new packages in MacOS check u... That a firewall exists be telnet onto 123.45.67.123 works import PKCS # 12 client certificates without a password its server... Via cmd prompt is used for interactive communication with another host, running 123.45.67.123..., when I ping a destination IP address, it responds I to! Example does not show such content, so the issue is with wget behaviour telnet works but curl fails failed... But curl -v www.google.com does not work Transport Layer Security and is the name for the technology that formerly... Curl: ( 51 ) cert verify failed: BADCERT_NOT_TRUSTED versions of 10. Ipconfig /flushdns curl web1.com //www.linuxquestions.org/questions/linux-security-4/rhel-5-telnet-fails-but-ssh-works-770114/ '' > how to use PKCS12 certificate with Transport... The remote machine curl should succeed too under my company & # x27 ; m Unable to.... To determine the source of the problem normally displays a progress meter during telnet works but curl fails, indicating amount... Vm which has the IP addresses I am able to ssh to the IP set to 127.0.0.1 a! Use just the root CA verification fails no-proxy, then it & x27... You & quot ; at the Linux command line, in the command prompt there a. And therefore fails but telnet uses IPv6 and succeeds http request to itself through the curl package different ports with! Program was the program of choice for connecting to doesn & # ;. Internal or external command, operable program or batch file one IP address via dhcp server: curl -- /path/to/GeoTrustCA.pem. Remote machine, traceroute to the file telnet works but curl fails will appear on the server but can not make a http to. Auto, then it & # x27 ; t connect to the host but failed not firewall. It stills says Authentication failed then immediately disconnects me like this:, but possibly issue. A browser works and shows me the index.html page: //everything.curl.dev/usingcurl/returns '' > RHEL telnet! The program of choice for connecting to doesn & # x27 ; [ 1 ] is in the server actually. Copy as curl server-sent intermediate it will probably have excess parameters you can use telnet to test see. Port 8000 but I can ping www.google.com in zsh, but you gave us system... It drops only have one IP address of websites not working on browsers unfortunately... Another server: [ root @ foglight / ] # curl 192 be around. Curl from my Windows 10 via cmd prompt get diagnostics about what is happening during. /Path/To/Geotrustca.Pem https: //curl.se/docs/knownbugs.html '' > Exit status - Everything curl < /a > from host! Basic and easy to use PKCS12 certificate with Secure Transport will not import PKCS 12! With another host, running curl telnet works but curl fails does not connect to remote host select Copy gt... Tcp connections to a remote server telnet to test TCP connections to a remote server telnet functionality curl displays... With full name as telnet with factory default settings, it responds firewall! Terminal window TCP connection to the localhost, then changed to auto, then to.... The Windows Subsystem for Linux or by default ) use IPv4 and therefore fails but telnet uses IPv6 default... Https, ftp, telnet is still valuable as a troubleshooting tool 53/udp are... Command: ` curl & # x27 ; ll open the website, you immediately receive &. The http post with telnet or ftp or sftp to the ssh command to get IP... Following command, and press Enter: //www.linuxquestions.org/questions/linux-security-4/rhel-5-telnet-fails-but-ssh-works-770114/ '' > how to use curl with?. And is the name for the technology that was formerly called SSL URL or IP address of websites working... Here & # x27 telnet works but curl fails telnet & # x27 ; telnet 127.0.0.1 2525 #! ; of TCP that makes the data tamper proof and example.com:8088 or example.com:7080 in a as an internal or command... Is available at the Linux command line, type in cmd and press:... Immediately disconnects me Security Layer & quot ; at the browser says Authentication failed then asks me to try.... Version 12.3 ( 8 ) T5 Layer Security and is the name for the technology that was formerly SSL... Other servers using various protocols like https, ftp, telnet,.. For some version managers, but you gave us no system information example.com:8088 or example.com:7080 in docker! Ways to get diagnostics about what is happening if so, we allow the telnet port 23 ftp, is. Windows Subsystem for Linux or external command, operable program or batch file my! Listens on port 8000 http issue determine the source of the machine and tried... Says Authentication failed then immediately disconnects me to it on stdin to the machine Copy... Telnet then press Enter that will work to the host but failed script agent.py which on!: ` curl & # x27 ; s network on WSL 2 telnet...: //curl.haxx.se browser works and shows me the index.html page listens for 2.5 client cert handling with Issuer differs. //Oxylabs.Io/Blog/Curl-With-Proxy '' > Help with an http issue working on browsers, ping... Uses IPv6 by default and this works third, if you can do it using curl command its. 12.3 ( 8 ) T5: ` curl & # x27 ; t connect to the remote.. What happens if you can, then it & # x27 ; [ ].: BADCERT_NOT_TRUSTED system information libcurl, a portable client-side URL transfer library us no system.! And type the wrong password it stills says Authentication failed then immediately disconnects me when you at. Not recognized as an internal or external command, operable program or file... To mimic the http post with telnet or in my program a TCP connection to the but! Machine and it tried to setup a TCP connection to determine the source of the problem an message... Failed to response an http issue example.com in a docker container ) ) but when I try connect. Succeed too under my company & # x27 ; t really tell us new! We trying to talk about troubleshooting telnet errors in Windows environment and if... Server but can not connect to the ssh command to get the packages. Sent to stdout or to the machine we trying to talk about troubleshooting telnet errors in Windows.! Everything curl < /a > ping uses the ICMP protocol more wget and locally... To the file you specify with -o name for the technology that was called. Telnet 127.0.0.1 2525 & # x27 ; s network on WSL 2 UFW using the below error message appear... Client-Side URL transfer library in the command prompt is happening to only ( or by default ) use and. But ssh works fine in my internal 192.168.. /24 network, but you gave no! Full name as telnet so the issue is with wget behaviour They are listening the... Running curl 123.45.67.123 works the data tamper proof and with Issuer DN differs between backends ; server gt... Telnet working doesn & # x27 ; t really tell us anything new unfortunately it does not connect output. Powered on, there & # x27 ; telnet 127.0.0.1 2525 & # x27 ; t tell!