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[BUG]: DevProxy interferes with other apps which urls aren't watched #1268
Description
Description
Currently when I enable DevProxy (as I need it for development) - some other apps, like the New Outlook and Whatsapp Desktop Client - stop functioning, like they don't seem to have internet access anymore until I stop the DevProxy and sometimes have to restart the app first, especially Whatsapp.
Expected behaviour
No interference with other apps which URLs aren't watched
Actual behaviour
Interference with other apps which URLs aren't watched
Steps to reproduce
Below happens instantly after starting the proxy, but sometimes after a little while - it's flakey buy always happens eventually
Outlook (using an Microsoft Exchange Online account, don't know if this is important)
- Open Outlook
- Start DevProxy
- Send yourself an email from your phone - or even from Outlook (won't send)
- It never shows up in Outlook as it lost internet access - same goes for trying to open an email which you haven't opened yet, or when trying to search
- Open Whatsapp
- Start DevProxy
- Try to send or download a file - messages seem to go through but not always
Dev Proxy Version
0.28.0
Operating system (environment)
Windows
Shell
PowerShell
Configuration file
{
"$schema": "https://raw.githubusercontent.com/dotnet/dev-proxy/main/schemas/v0.28.0/rc.schema.json",
"plugins": [
{
"name": "DevToolsPlugin",
"enabled": true,
"pluginPath": "~appFolder/plugins/dev-proxy-plugins.dll"
}
],
"urlsToWatch": [
"https://b2bapi.snelstart.nl/*",
"https://auth.snelstart.nl/*"
],
"logLevel": "information",
"newVersionNotification": "stable",
"showSkipMessages": true
}Additional Info
No response
Activity
waldekmastykarz commentedon Jun 25, 2025
Thanks for reporting the issue and sorry for the trouble @ThaDaVos. Have you by any chance seen a similar issue with other proxies such as Fiddler? I wonder if what you're seeing could be caused by certificate pinning or something similar. Even though Dev Proxy is not decrypting these URLs, it's still present in the request pipeline.
As a possible workaround you could consider:
Settings > Network & Internet > Proxy > Use the proxy server except for addresses that start with the following entries.--as-system-proxy falsein command line or"asSystemProxy": falseindevproxyrc.json) and explicitly send your application traffic to Dev Proxy (eg. by setting thehttps_proxyenv var for your application)I hope this helps.