Question : Unable to access exchange webmail from a remote office

We have an exchange webmail server located at a remote office and a user at a remote office that usually logs in to the server was unable to access the exchange webmail homepage. Some other users on other remote offices could access the server.

The user at the remote office that couldn't access the server got this message on his opera browser:

The server certificate chain is incomplete, and the signer(s) are not registered. Accept?

On trying Microsoft IE, the following message came up:
We recommend that you close this webpage and do not continue to this website.  
  Click here to close this webpage.  
  Continue to this website (not recommended).  

When he clicked continue to this website, it did not make any difference. Other websites with https are accessible.

What do you think could be the problem?

Answer : Unable to access exchange webmail from a remote office

The problem is that you're storing the connection string in an application variable. Application variables are shared by all the application users, so when you set the connection string for a user really you're setting it for all users.

If each user must have its own connection string, then store it in session variables instead of application variables.

Hope that helps.