#748: Network error when accessing Swarmica

Symptoms

While working in Swarmica, the error Network error appears. Sometimes the error occurs after waking the computer from sleep or reconnecting VPN, and sometimes it is consistently reproduced only in the corporate network.

{
  "url": "/users/wbGToF90phVxHQHW/",
  "method": "get",
  "message": "Network Error"
}

Alternatively, the Hyper-V network driver error may occur:

hv_netvsc ... eth0: nvsp_rndis_pkt_complete error status: 2

This error can lead to packet loss and delays. It belongs to the Hyper-V/network infrastructure and does not prove the presence of an error in Swarmica.

Causes

• brief network interruption or switching, VPN, Wi‑Fi;
• expired or interrupted browser connection after inactivity;
• corporate WAF, proxy, or another network security tool blocks API requests or rewrites their URLs;
• instability of the virtual machine's network interface or Hyper-V.

What the user should do

1. Refresh the page.
2. Check the operation without VPN or from another network, with a mobile phone. If everything works in another network, there is likely a problem with the corporate network.
3. Repeat the action after reconnecting to the network/VPN.
4. Open the browser developer tools (F12) → Network → Fetch/XHR, repeat the action and save the URL, method, HTTP status, and details of requests with statuses 403, 404, 5xx or marked as blocked.

What to tell the IT security service or network administrator

Ask them to check WAF, proxy, and traffic filtering rules for the Swarmica domain. It is important to make sure that API requests are not blocked or rewritten, in particular requests of the form /api/users/{uid}/. If a virtual machine is used, check the Hyper-V system logs and network interface for hv_netvsc errors. For diagnosis, provide the time of the error, request URL/method, HTTP status, and HAR file without authorization tokens and personal data.

When to contact support

If the error persists in different networks or after refreshing the page, send a screenshot to support, the time of occurrence, browser, connection method, and data from Network without secret headers. If the problem occurs only in the corporate network, first submit the check results to the IT security service or network administrator.