error（-106）

when opening Add-Ons I received error massage 【Failed to load URL https://www.mathworks.com/add-ons/loading?platform=Win64&language=en-US&release=R2017a&docLanguage=en-US&viewer=ml_desktop&connectorUrls=%7B%22login%22%3A%22https%3A%2F%2Flocalhost%3A31515%2Ftoolbox%2Fmatlab%2Fmatlab_login_framework%2Fweb%2Findex.html%3Fsnc%3DLNX0SJ%22%2C%22matlab%22%3A%22https%3A%2F%2Flocalhost%3A31515%2Ftoolbox%2Fmatlab%2Faddons%2FGalleryMatlabCommunicator.html%3Fsnc%3DCCJ9FW%26channelId%3D965.0%22%2C%22ssi%22%3A%22https%3A%2F%2Flocalhost%3A31515%2Fui%2Finstall%2Fsupportsoftwareclient%2Fsupportsoftwareclient%2Findex.html%3Fsnc%3DQSD4VQ%22%7D&entitlementId=1252532&licenseMode=FlexLicense&ddux=%7B%22installationId%22%3A%22%22%2C%22machineHash%22%3A%225bad4a5d79faf1e1b3cb216384f62cd0%22%2C%22sessionKey%22%3A%22bd205fac-12cc-4cb9-ab48-f5e241bd914a%22%7D&navigateTo=%7B%22entryPoint%22%3A%22AddOns%22%7D with error (-106).】in Matlab R2017a。how to solve this problem。

[Walter Roberson]

106 appears to indicate Internet Connection Lost