Hello, I need an advise from the experts.
For the past 2 months we have been receiving captcha challenges when browsing multiple websites at work. It’s only happening on the company’s network and for all users. Since we are behind a SonicWall firewall, I already contacted SonicWall support, they ran a few tools to see if there was an issue that could cause this, we also captured multiple packets to analyze if a computer within the network was the issue, but all the tests were fine, there were no red flags. I also contacted the our ISP and asked them to check if maybe our static IP was blacklisted and their reports came negative, our IP address has no issues. Just to double check, I confirmed this information using MX toolbox. We have scan all of our PCs for malware and all are clean. We also change our preferred dns to point to google’s just to test and the issue didn’t resolve.
Any advise on what should I check to try to resolve this?
Thanks in advanced.