Https connection getting stuck in squid for random clients

[piovisqui]

Hi.

I'm having a weird problem. Some  random clients in my network are getting their 443 connections blocked by squid. All https connections have the state  TIME_WAIT from the client.

Example:
tcp 10.1.0.1:8080 <- 10.1.0.111:51441 TIME_WAIT:TIME_WAIT

When I put the client on the firewall rule that bypass the proxy, the connection works. The problem only occur when using squid and for 2 clients among 100.

Has anyone seen this? How to debug or fix this?