Sometimes the Internet connecting condition is not good for sellers to manage their selling account on eBay and Amazon. Frequently lost connection, slowly upload speed is highly limited sellers business.
Especially in China, the OUTSIDE WORLD is hardly to reach. Then, I wondered, may I login to my account through a VPN? I consulted Amazon Seller Support Team, and they replied me a positive answer, sellers are allowed to login to Amazon sellercentral with a VPN.
