Inability to access a server with my websites from this modem/router C3700v2

[Obinna]

Recently, became unable to connect via web and ftp to a particular server from this particular modem/router. There is no problem connecting to the server from another location (different router), or connected via AT&T wireless network  It is a home networking router. N600/C3700v2). This started happening the following day after I had done a lot of ftp work. In layman's terms, it appears as if the router is blocked by the server. I usually access the serve using Wondows 10 PC.

This site can’t be reached

omoli.com took too long to respond.

Try:

• Checking the connection
• Checking the proxy and the firewall
• Running Windows Network Diagnostics

ERR_CONNECTION_TIMED_OUT

[FURRYe38]

Try a factory reset on the modem and setup from scratch. Soon as the setup wizard is complete, try that site. The site is marked as unsafe so maybe the modem doesn't know how to process that. 

Try a different device or PC to compare results while connected at the modem.