Could not connect to Gwent servers

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I have some problems connecting to gwent servers recently. I have no idea what happened. I can visit any websites I want. I can visit the store in GOG galaxy client. But everytime I try to log in gwent, it says "Could not connect to Gwent servers. Please verify your connection." I try some other network and there is no such problem. But when changed back to the network I use at home, it still doesn't work. I have tried to restart GOG and relogin my account, nothing would help. Is there any guidance to help solve this problem? Or at least help to figure out the reason?
 
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