- Cisco Anyconnect Connection Timed Out
- Cisco Anyconnect Connection Attempt Timed Out
- Cisco ASA 5500 Series Adaptive Security Appliances
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SOLVED establish a connection I'm using Cisco AnyConnect this issue, even after timeout setting and use timed out, please verify can now access my has failed. I've noticed for the past couple months that users are unable to connect when on the AT&T network. It doesn't matter if we use the AnyConnect mobile app or if we use the phone as a hotspot and connect a laptop to that. We get the following error: Connection attempt has timed out. Please verify Internet connectivity. This video describes, how to solve, Failed to initialize connection subsystem errorMusic:Avant Jazz - Disco Ultralounge by Kevin MacLeod is licensed under a.
Question:
Why do we see 502 / 504 GATEWAY_TIMEOUT errors when browsing to certain sites?
Symptoms: Users are receiving 502 or 504 gateway timeout errors from the Cisco WSA when browsing to certain websites
Users are receiving 502 or 504 gateway timeout errors when browsing to websites. Access logs would either show 'NONE/504' or 'NONE/502'
Symptoms: Users are receiving 502 or 504 gateway timeout errors from the Cisco WSA when browsing to certain websites
Users are receiving 502 or 504 gateway timeout errors when browsing to websites. Access logs would either show 'NONE/504' or 'NONE/502'
Sample Access log line:
1233658928.496 153185 10.10.70.50 NONE/504 1729 GET http://www.example.com/ - DIRECT/www.example.com - ....
There are many reasons why WSA may return a 502 or 504 gateway timeout error. Although these error responses are similar, it's important to understand the subtle differences between them.
Here are a few examples of the types of scenarios that may occur:
Here are a few examples of the types of scenarios that may occur:
- 502: The WSA has attempted to establish a TCP connection with the web server, but has not received a SYN/ACK.
- 504: The WSA is receiving a TCP reset (RST) terminating the connection with the web server.
- 504: The WSA is not getting a response from a required service prior to communicating with the web server, such as DNS is failing.
- 504: The WSA has established a TCP connection with the web server and sent a GET request, but the WSA never receives the HTTP response.
Below are examples of each scenario and more details regarding potential issues:
502: The WSA has attempted to establish a TCP connection with the web server, but has not received a SYN/ACK. |
If the web server does not respond to the WSA's SYN packets, after a certain amount of attempts, the client will be sent a 502 Gateway Timeout error. Typical causes for this are: 1. The web server or web server network is having issues. 2. A network issue on the WSA network is preventing the SYN packets from getting to the Internet. 3. A firewall or similar device is dropping either the WSA SYN packets or the web server's SYN/ACK 4. IP spoofing is enabled on the WSA, but is not properly configured (no return path redirection) Troubleshooting steps: The first step is to verify if the WSA can ICMP ping the web server. This can be done by using the following CLI command: WSA> pingwww.example.com If the ping fails, it does not mean that the server is down. It may mean that ICMP packets are getting blocked somewhere in the path. If the ping succeeds, then we can know for sure that the WSA has a basic layer3 level of connectivity to the web server. A telnet test will verify if the WSA has the ability to establish a TCP connection on port 80 to the web server. See the instructions further in this article for performing a telnet test. Todoist release notes 2020. Network issues or Firewall block If the ping is successful, but the telnet fails, there is a good possibility that a filtering device, such as a firewall, is preventing this traffic from getting through the network. It is recommended that the firewall logs and/or packet captures from the firewall are analyzed for further details. IP Spoofing enable, but not properly configured If explicitly proxying through the WSA or the telnet test is successful, this shows that the WSA can communicate directly to the web server, but when a client proxies through the WSA with IP spoofing, there is a problem. Without client IP spoofing:
With client IP spoofing:
|
504: The WSA is receiving a TCP reset (RST) terminating the connection with the web server. |
If the WSA receives a TCP reset packet on its upstream connection to the web server, the WSA will send a 504 Gateway Timeout error to the client. Typical causes for this are: 1. The Cisco Layer 4 Traffic Monitor (L4TM) is blocking the WSA proxy from connecting the web server. 2. A firewall, IDS, IPS, or other packet inspection device is blocking the WSA. Troubleshooting steps: First determine if the TCP RST is coming from the L4TM or from another device. If the L4TM is blocking this traffic, the traffic will show up in the GUI reports under 'Monitor -> L4 Traffic Monitor'. Otherwise, the RST is coming from a different device. L4TM Blocking: It is recommended that if the L4TM is blocking, do not block on ports that the WSA proxy is also running on. There are multiple reasons for this: 1. The WSA proxy provides a friendly error message in the case of problem, instead of just TCP resetting the connection. This will help limit confusion from the end users when they are blocked. 2. The WSA proxy has the ability to scan and block specific content, whereas the L4TM blocks all traffic matching an blacklisted IP address. In order to configure the L4TM to not block on proxy ports, go to 'GUI -> Security Services -> L4 Traffic Monitor'. If the site is a known bad web site, but there are reasons why the traffic should be allowed, the site can be white listed in: 'GUI -> Web Security Manager -> L4 Traffic Monitor -> Allow List' Firewall / IDS / IPS Blocking: If another device on the networking is blocking the WSA from connecting to the web server, it is recommended to analyze the following: 1. Firewall block logs 2. Ingress / Egress packet captures during the problem The block logs may quickly confirm if the device is blocking the WSA. Sometimes a firewall, IPS, or IDS will block traffic and NOT log it appropriately. If this is the case, the only way to prove where the TCP RST is coming from, is to obtain ingress and egress captures from the device. If a RST is being sent out the ingress interface and no packets traveled through the egress side, the security device is definitely the cause. |
504: The WSA has established a TCP connection with the web server and sent a GET request, but the WSA never receives the HTTP response. |
If the WSA sends an HTTP GET, but never receives a response, it will send a 504 Gateway Timeout error to the client. Typical causes for this are:
The firewall block logs may quickly confirm if / why the device is blocking the WSA. Sometimes a firewall, IPS, or IDS will block traffic and NOT log it appropriately. If this is the case, the only way to prove where the TCP RST is coming from, is to obtain ingress and egress captures from the device. If a RST is being sent out the ingress interface and no packets traveled through the egress side, the security device is definitely the cause. |
Cisco Anyconnect Connection Timed Out
Testing connectivity with a web server using telnet |
From the WSA CLI, run the telnet command: WSA> telnet Please select which interface you want to telnet from. 1. Auto 2. Management (192.168.15.200/24: wsa.hostname.com) 3. P1 (192.168.113.199/24: data.com) [1]> 3 Enter the remote hostname or IP address. []> www.example.com Enter the remote port. [25]> 80 Trying 10.3.2.99.. Connected towww.example.com. Escape character is '^]'. Note: The 'Connected' message in red, indicates that TCP successfully established between the WSA and web server. An HTTP request can manually be sent through this telnet session as well. The following is a sample request that can be typed after the 'Connected' message: ------------------------------------------------------------------------------------- GEThttp://www.example.comHTTP/1.1 HOST:www.example.com {Enter} ------------------------------------------------------------------------------------- Note: Make sure to add the extra carriage return at the end, otherwise the server will not respond to the request. |
Cisco Anyconnect Connection Attempt Timed Out
Topics Map > Networking > Virtual Private Networking (VPN)
After connecting to the VPN client, Internet connectivity stops working (including network shared drives). The network connection may show up as 'Local Connection Only.'
These steps are adapted from: http://msdynamicstips.com/2011/06/27/vpn-connection-disconnects-internet-connection/.
On Windows 7:
1. Click on the Start button.
2. In the search box, type ncpa.cpl. Press Enter.
3. The Network Connections window should open. Right click on the Cisco AnyConnect Secure Mobility Client Connection. Click on Properties
4. Select the Networking tab.
5. Select Internet Protocol Version 4 (TCP/IPv4) from 'This connection uses the following items.'
6. Click on Properties. Click on Advanced. Make sure there is nothing listed under Default gateway using the Remove button to remove any that are there.
7. Close the Network Connections window. Attempt to connect to the VPN and then the Internet.
Windows 8, 8.1, 10:
Instead of using the Start button, begin with the Search tool. The rest of the Windows 7 steps will work for Windows 8.
On Windows 7:
1. Click on the Start button.
2. In the search box, type ncpa.cpl. Press Enter.
3. The Network Connections window should open. Right click on the Cisco AnyConnect Secure Mobility Client Connection. Click on Properties
4. Select the Networking tab.
5. Select Internet Protocol Version 4 (TCP/IPv4) from 'This connection uses the following items.'
6. Click on Properties. Click on Advanced. Make sure there is nothing listed under Default gateway using the Remove button to remove any that are there.
7. Close the Network Connections window. Attempt to connect to the VPN and then the Internet.
Windows 8, 8.1, 10:
Instead of using the Start button, begin with the Search tool. The rest of the Windows 7 steps will work for Windows 8.
A customer did submit this tidbit:
My computer had a software named Connectify which is used for creating ad-hoc. And in the adapter settings there was an option regarding connectify. I disabled it and everything worked fine.
Cisco ASA 5500 Series Adaptive Security Appliances
See Full List On Cisco.com
Technology Services note: Any software that allows you to share your computer's network connection with others will interfere with the VPN. Uninstall or disable the software, reboot your computer, and try the VPN again.