Windows pop-up message as belows:
Unable to bind to port [Localhost:8888]. ErrorCode: 10048. This is usually due to another service running on this port. Run NETSTAT -A at a command prompt.
What can I do?
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Tools menu ->
Fiddler Options ->
Connections tab ->
Fiddler listens on port
There you can change the port that Fiddler uses.
I had a similar situation while working with my local web server. After this error message Fiddler didn't monitor any of my connections from the browser.
I did changed port on 8085 in Fiddler Options -> Connections tab -> Fiddler listens on port: but I also checked check box "Act as system proxy on startup", and after restart it started to work as usual.
I hope it helps.
netstat -a, as instructed? What was the result?