I have a few EX4550s and EX4300s, and occassionally we like to go into the web interface; however, the https web interface times out occasionally. For instance, I have an EX4550 right now, and the https web interface isn't responding, but I can see from a port scan that it is listening on that port.
This is what I see when I run show system services web-management:
If I enable http, that will work, but still not https. I have also executed run restart web-management, but that doesn't seem to have an effect.
I am running JUNOS 12.3R6.6 which is an older build, but I wouldn't think that would be an issue.
You're not an authorzed ip I think. Mine does the same and says this:
 tcannon@SRX-B# run monitor start stall
 tcannon@SRX-B# *** stall *** May 17 18:16:58 httpd_gk_mgd_connect_cb, WEBAUTH IPADDR request received for local ipv4: ipaddr (10.0.0.67) May 17 18:16:58 is_webauth_enabled, Sending webauth login request to fwauthd for IP ipv4: ipaddr (10.0.0.67) May 17 18:16:58 is_webauth_enabled: can not get pid for fwauthd (2:No such file or directory), return NOT_WEBAUTH_IP.