> Source: [sk166653](https://support.checkpoint.com/results/sk/sk166653) # sk166653 - ISL Light for Remote Support unable to connect to 1500 appliance, and as soon as you open the ISL app the fw-logfiles show "Application Control - HTTP parsing error occurred" | Property | Value | |----------|-------| | Solution ID | sk166653 | | Date Created | 2020-05-05 | | Last Modified | 2022-07-20 | | Technical Level | General | | Products | Spark Firewall (Locally Managed) | | Versions | R81.10.X | | Platform | 1500, 1600, 1800 | ## Symptoms - * ISL Light for Remote Support unable to connect to 1500 appliance, and as soon as you open the ISL app the security logs show drops due to "Application Control - HTTP parsing error occurred". * ISL light fails to connect if Applications \& URL Filtering is "ON". * When Applications \& URL Filtering is "OFF", ISL Light login works fine. ## Cause ISL uses a connection that is partially in http protocol (with non-standard port) and partially not-http.
## Solution This problem was fixed. The fix is included in: * [**Check Point R80.20.05**](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk164912 "Check Point R80.20.05") Check Point recommends to always upgrade to the most recent version ([Check Point 1500 appliance](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&product=512 "Check Point 1500 appliance")). --- # Agent Instructions This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products. ## Navigating This Knowledge Base - **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt) - **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml) - **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}` - **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content