Simlink disconnecting

[skysail]

That log includes numerous instances of requests failing to reach our servers. I can assure you that they are up and running and reachable (Amazon is responsible for this), so the issue is somewhere between you and your ISP (Internet Service Provider).

Please note that your internet connection could be absolutely fine, but your ISP could still be having a hard time routing the requests through their network to Amazon - this happens now and then and only the ISP can fix it.

Unfortunately, it is tough to narrow this down further. Please start by making completely sure that your computer time is correctly set. You can verify this by opening https://time.is - it should immediately tell you how far behind your clock is running.

If the clock is fine, then you’ll have to keep digging. Our logs just show that your computer is having trouble reaching our servers, so here are a few more steps that could be useful:

@skysail

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Network stability

Issue
The network is unstable. Sub-second disconnects that are not apparent when browsing cause critical communications with our servers to outright fail because the application is unable to reach the internet, alternatively being aborted “mid-flight”.

Proposed solution
Try to move to a more stable connection. If you’re on WiFi, see if it is possible to connect your computer using a network cable instead. If you’re already using a cable, make sure that you don’t have any loose connections anywhere.

In order to exclude connectivity issues, please attempt to use the “personal hotspot” feature of your smartphone or some other source of internet.

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Firewall rules

Issue
The firewall (either as part of your computer’s built-in/third-party anti-virus or as part of your router/modem) is blocking the connection, resulting in communication between the application being forced to a standstill due to incorrectly set up rules.

Proposed solution
Configure your firewall to allow traffic associated with the Navigraph Charts and Navigraph Navdata Center.

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DNS Issues

Issue
The DNS server is either not responding at all (incorrectly configured) or contains bad/outdated records, resulting in invalid communication between application and the internet.

Proposed solution
Try to (re)configure your DNS server, preferably using a reliable provider such as Google (8.8.8.8 and 8.8.4.4).

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Proxies

Issue
Your internet connection is behind a proxy or is being intercepted. There are multiple reasons why this might be the case, here are a few examples:

• You are using a work computer that has a proxy set up by default
• You are using a proxy for personal/security reasons
• Your anti-virus is intercepting all traffic to scan for malware
• Your anti-virus/network security software has installed a self-signed certificate to encrypt insecure connections
• You have tried to reverse-engineer our or someone else’s applications using reverse-proxy tools like Wireshark, Charles, and the BURP suite and then forgot to turn it off.
• You have been infected with malware that is now actively deploying a MITM (Man-in-the-middle) attack towards you.

Proposed solutions

• Disable any proxies
• Investigate if turning off any anti-virus solves the issue
• Disable any active reverse proxies
• Investigate if your antivirus has any features related to scanning/intercepting network traffic. If it does, try to find related settings and turn them off temporarily to see if that resolves the issue.
• Run virus scans for the whole system. Also, run a rootkit scanner such as this one .