Upgraded V5.31 (USG20w-VPN) from FW 4.65 (Standby Space) Now Blocks Port 4500

SierraTech

@Zyxel_Stanley

I won't enable uPNP for security reasons.  It has been a week since I rolled back to 4.65 and WiFi Calling has been stable through out the home all week (all Access Points). It's the only way I can receive and make cell calls from my office, located in my home.

Something is wrong with 5.31 (probably occurred sooner than that since I haven't tested previous releases, other than 5.30 which didn't work either).

Since we have no reliable cell service, I must stay on 4.65, which makes me uncomfortable.  I posted my settings in original post how I got it to work in 4.65, but as topic reveals, these settings do not work in 5.31.

PeterUK

One thing to try is set in config > security policy > session control the UDP session time out to say 3600

You know this would solve this problem...
Source port for firewall Policy control — Zyxel Community 
But NAT may also need source port option to destination any port...  

Zyxel_Stanley

Hi @SierraTech
I will send private message to you for further check the issue on 5.31 firmware.

SierraTech

@PeterUK

Thanks for feedback, I will look into your post for further detail.

The destination port number isn't always the same. I haven't had much time to deal with this, but I appreciate your feedback on this topic.

SierraTech

@Zyxel_Stanley

I just saw your PM, I've been backed up with my schedule, sorry for delayed response. I did send a PM back to you to coordinate.

SierraTech

@Zyxel_Stanley

Will try and schedule this middle of next week, and I will call forward my cell phone to my Voip Line.

SierraTech

@Zyxel_Stanley

Sent you PM. I have since updated Standby firmware from 5.31 to V5.35(ABAR.0) and testeing WiFi-Calling (the Version I'm running). WiFi calling appears to be working much better!

I had to stay on V4.65 since WiFi calling would not work on V5.31.

I don't see Port 4500 being blocked. Will keep an eye on logs!