hi ,



a1 is not blocking ports

except port 25 incoming and one port for remote access

in the past this was port 443 for incoming connections

with actual firmware i don't know which port actually is used for remote access

they have changed it

outgoing ports are not blocked at all



so which port is used for your vpn ?

and do you speak from a incoming or outgoing port

or in other words ... is it a external vpn you connect to or a internal vpn in your network ?

is your internet connection still configured for 'always on' ?

a1 default setting is 'connection on demand' for a1 routers

you can see this on a1 routers webinterface (main page)



it could be that this modem with this firmware is making problems

but first we have to check for other things

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Hi again,

Thank you for your help!It took me a while to reply because it started working fine again and I didn't understand why.Now I have understood.First, to answer your questions, it's an external VPN server (of my company). I can connect to our testing environment, which is on the same server (same IP), but port 443. I cannot connect to the port of our other environment (for security reasons, it's better if I don't post it here right now).I found out that when I'm uploading a large file (files) using the internet connection, the port seems to become unusable. This and others, except the normal 443 ones, the skype ones, and mail.I have tested this: upload a "large" file (200MB), connection to VPN goes down, finish uploading, connection comes back. Yesterday, when I started having problems all day, I was uploading files to Google Drive. Never thought the two things would be related.Any ideas?

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hello ,



yes, this is a well known problem

a upload using the full bandwith also effects the download

it has nothing to do with unstable ports

the communication in general slows down or goes into timeouts

it is always a two way communication and one way is blocked in this case

and some apps are more effected than others

only good qos settings can help

but qos cannot be configured on a1 modem's

reason is that this functions are locked ... no full access on a1 modems



you can only avoid uploads during vpn sessions or you have to use your own router

also software solutions like cfosspeed can help

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ok, thank you!It's still strange that it only happened now, as I had the same router for almost a year, and definitely working the same way with VPN for that amount of time too... Anyway, if there's nothing you can do, thank you for your time!

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The only reason for this change from my point of view could be a change in the relation between the maximum speed of your internet connection and the maximum speed of the google server (google drive) in this case. Just if you want to find out more details of this problem.

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